Fix issue #301:

summary of changes:
- Use MANGLE when loading some constants into MMX registers.
- Convert those constants to non-static and thus add ff_ prefix.
- Remove last parameter of MSPEL_FILTER13_CORE (was constant).
- Use of "+r" instead of stricter but unnecessary "+g".
- Use of REG_c and direct loading of some of the above.
patch by Christophe GISQUET, christophe.gisquet free fr
Subject: [FFmpeg-devel] [PATCH] Roundup issue #301
Date: Fri, 28 Dec 2007 19:22:18 +0100

Originally committed as revision 11376 to svn://svn.ffmpeg.org/ffmpeg/trunk