Remove all .cvsignore files, they are no longer necessary.

Originally committed as revision 5410 to svn://svn.ffmpeg.org/ffmpeg/trunk

.cvsignore

-config.h
-config.mak
-config.log
-*ffmpeg
-ffmpeg_g
-ffserver
-Makefile.*
-.depend
-.libs
-ffplay
-ffplay_g
-output_example
-qt-faststart
-*.pc

doc/.cvsignore

-faq.html
-ffmpeg-doc.html
-ffmpeg.1
-ffplay-doc.html
-ffplay.1
-ffserver-doc.html
-ffserver.1
-hooks.html

libavcodec/.cvsignore

-Makefile.*
-.depend
-amr
-amr*_float
-apiexample
-*-test

libavformat/.cvsignore

-config.h
-config.mak
-*ffmpeg
-ffserver
-Makefile.*
-.depend

tests/.cvsignore

-config.h
-config.mak
-*ffmpeg
-ffserver
-Makefile.*
-.depend
-dsptest
-dsptestpic
-asynth1.sw
-audiogen
-data
-rotozoom
-tiny_psnr
-videogen
-vsynth1
-vsynth2