Add copyright notice from the Independent JPEG Group instead of referring

to a README we don't include.

Originally committed as revision 6157 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/jfdctfst.c

 /*
  * jfdctfst.c
  *
- * Copyright (C) 1994-1996, Thomas G. Lane.
  * This file is part of the Independent JPEG Group's software.
- * For conditions of distribution and use, see the accompanying README file.
+ *
+ * The authors make NO WARRANTY or representation, either express or implied,
+ * with respect to this software, its quality, accuracy, merchantability, or
+ * fitness for a particular purpose.  This software is provided "AS IS", and
+ * you, its user, assume the entire risk as to its quality and accuracy.
+ *
+ * This software is copyright (C) 1994-1996, Thomas G. Lane.
+ * All Rights Reserved except as specified below.
+ *
+ * Permission is hereby granted to use, copy, modify, and distribute this
+ * software (or portions thereof) for any purpose, without fee, subject to
+ * these conditions:
+ * (1) If any part of the source code for this software is distributed, then
+ * this README file must be included, with this copyright and no-warranty
+ * notice unaltered; and any additions, deletions, or changes to the original
+ * files must be clearly indicated in accompanying documentation.
+ * (2) If only executable code is distributed, then the accompanying
+ * documentation must state that "this software is based in part on the work
+ * of the Independent JPEG Group".
+ * (3) Permission for use of this software is granted only if the user accepts
+ * full responsibility for any undesirable consequences; the authors accept
+ * NO LIABILITY for damages of any kind.
+ *
+ * These conditions apply to any software derived from or based on the IJG
+ * code, not just to the unmodified library.  If you use our work, you ought
+ * to acknowledge us.
+ *
+ * Permission is NOT granted for the use of any IJG author's name or company
+ * name in advertising or publicity relating to this software or products
+ * derived from it.  This software may be referred to only as "the Independent
+ * JPEG Group's software".
+ *
+ * We specifically permit and encourage the use of this software as the basis
+ * of commercial products, provided that all warranty or liability claims are
+ * assumed by the product vendor.
  *
  * This file contains a fast, not so accurate integer implementation of the
  * forward DCT (Discrete Cosine Transform).

libavcodec/jfdctint.c

 /*
  * jfdctint.c
  *
- * Copyright (C) 1991-1996, Thomas G. Lane.
  * This file is part of the Independent JPEG Group's software.
- * For conditions of distribution and use, see the accompanying README file.
+ *
+ * The authors make NO WARRANTY or representation, either express or implied,
+ * with respect to this software, its quality, accuracy, merchantability, or
+ * fitness for a particular purpose.  This software is provided "AS IS", and
+ * you, its user, assume the entire risk as to its quality and accuracy.
+ *
+ * This software is copyright (C) 1991-1996, Thomas G. Lane.
+ * All Rights Reserved except as specified below.
+ *
+ * Permission is hereby granted to use, copy, modify, and distribute this
+ * software (or portions thereof) for any purpose, without fee, subject to
+ * these conditions:
+ * (1) If any part of the source code for this software is distributed, then
+ * this README file must be included, with this copyright and no-warranty
+ * notice unaltered; and any additions, deletions, or changes to the original
+ * files must be clearly indicated in accompanying documentation.
+ * (2) If only executable code is distributed, then the accompanying
+ * documentation must state that "this software is based in part on the work
+ * of the Independent JPEG Group".
+ * (3) Permission for use of this software is granted only if the user accepts
+ * full responsibility for any undesirable consequences; the authors accept
+ * NO LIABILITY for damages of any kind.
+ *
+ * These conditions apply to any software derived from or based on the IJG
+ * code, not just to the unmodified library.  If you use our work, you ought
+ * to acknowledge us.
+ *
+ * Permission is NOT granted for the use of any IJG author's name or company
+ * name in advertising or publicity relating to this software or products
+ * derived from it.  This software may be referred to only as "the Independent
+ * JPEG Group's software".
+ *
+ * We specifically permit and encourage the use of this software as the basis
+ * of commercial products, provided that all warranty or liability claims are
+ * assumed by the product vendor.
  *
  * This file contains a slow-but-accurate integer implementation of the
  * forward DCT (Discrete Cosine Transform).

libavcodec/jrevdct.c

 /*
  * jrevdct.c
  *
- * Copyright (C) 1991, 1992, Thomas G. Lane.
  * This file is part of the Independent JPEG Group's software.
- * For conditions of distribution and use, see the accompanying README file.
+ *
+ * The authors make NO WARRANTY or representation, either express or implied,
+ * with respect to this software, its quality, accuracy, merchantability, or
+ * fitness for a particular purpose.  This software is provided "AS IS", and
+ * you, its user, assume the entire risk as to its quality and accuracy.
+ *
+ * This software is copyright (C) 1991, 1992, Thomas G. Lane.
+ * All Rights Reserved except as specified below.
+ *
+ * Permission is hereby granted to use, copy, modify, and distribute this
+ * software (or portions thereof) for any purpose, without fee, subject to
+ * these conditions:
+ * (1) If any part of the source code for this software is distributed, then
+ * this README file must be included, with this copyright and no-warranty
+ * notice unaltered; and any additions, deletions, or changes to the original
+ * files must be clearly indicated in accompanying documentation.
+ * (2) If only executable code is distributed, then the accompanying
+ * documentation must state that "this software is based in part on the work
+ * of the Independent JPEG Group".
+ * (3) Permission for use of this software is granted only if the user accepts
+ * full responsibility for any undesirable consequences; the authors accept
+ * NO LIABILITY for damages of any kind.
+ *
+ * These conditions apply to any software derived from or based on the IJG
+ * code, not just to the unmodified library.  If you use our work, you ought
+ * to acknowledge us.
+ *
+ * Permission is NOT granted for the use of any IJG author's name or company
+ * name in advertising or publicity relating to this software or products
+ * derived from it.  This software may be referred to only as "the Independent
+ * JPEG Group's software".
+ *
+ * We specifically permit and encourage the use of this software as the basis
+ * of commercial products, provided that all warranty or liability claims are
+ * assumed by the product vendor.
  *
  * This file contains the basic inverse-DCT transformation subroutine.
  *