mpcodecs: Use XXX_INLINE defines for inline asm

Patch-by: Matt Oliver <protogonoi@gmail.com>
Reviewed-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@37325 b3059339-0415-0410-9bf9-f77b7e298cf2