configure: add CONFIG_H263DSP to preempt build problems

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36501 b3059339-0415-0410-9bf9-f77b7e298cf2
mplayer: Fix a crash seeking with -chapter and -ass

When seeking to chapter on startup the mpctx->d_sub member
is not yet initialized. Do not access it in that case.

The commit r31293 that introduced that code explains that
it is for handling backward seeking correctly. So it should
not be needed on startup forward seek situation.



git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36502 b3059339-0415-0410-9bf9-f77b7e298cf2