lavf: fix AVSEEK_SIZE when STREAM_CTRL_GET_SIZE is not implemented.

Would set the size to an uninitialized value before.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@37281 b3059339-0415-0410-9bf9-f77b7e298cf2
bluray: check bd_seek result more thoroughly.

Also implement GET_SIZE stream control.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@37282 b3059339-0415-0410-9bf9-f77b7e298cf2
bluray: fix seek implementation again.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@37283 b3059339-0415-0410-9bf9-f77b7e298cf2
bluray: Fix STREAM_CTRL_SEEK_TO_TIME for out-of-bound values.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@37284 b3059339-0415-0410-9bf9-f77b7e298cf2
configure: fix up some FFmpeg config.h defines, especially for ARM.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@37285 b3059339-0415-0410-9bf9-f77b7e298cf2