move it from sdp.c into utils.c. Also add new header internal.h specifically
for lavf-specific internal API. See discussion in "Realmedia patch" thread
on mailinglist.
Originally committed as revision 15002 to svn://svn.ffmpeg.org/ffmpeg/trunk
Log:
Add missing header #includes.
Policy violation (change not approved by maintainer)
and while discussions where ongoing and no consensus has been reached.
Originally committed as revision 14500 to svn://svn.ffmpeg.org/ffmpeg/trunk