This unused header is a placeholder for work in progress(?).
This makes checkheaders pass again.
Originally committed as revision 22338 to svn://svn.ffmpeg.org/ffmpeg/trunk
SKIPHEADERS-$(CONFIG_VAAPI) += vaapi_internal.h
SKIPHEADERS-$(CONFIG_VDPAU) += vdpau.h
SKIPHEADERS-$(CONFIG_XVMC) += xvmc.h
SKIPHEADERS-$(CONFIG_VAAPI) += vaapi_internal.h
SKIPHEADERS-$(CONFIG_VDPAU) += vdpau.h
SKIPHEADERS-$(CONFIG_XVMC) += xvmc.h
+SKIPHEADERS += mpegaudio3.h