Consistently apply this rule: the guard name is obtained from the
filename by stripping the leading "lib", converting '/' and '.' to
'_' and uppercasing the resulting name. Guard names in the root
directory have to be prefixed by "FFMPEG_".
Originally committed as revision 15120 to svn://svn.ffmpeg.org/ffmpeg/trunk
Patch by Ian Caulfield, ian D caulfield <at> gmail D com
Thread: [PATCH] MLP/TrueHD decoder, 12 Oct 14:26
Originally committed as revision 11109 to svn://svn.ffmpeg.org/ffmpeg/trunk
