Allow the compilation of more than one hwaccel format.

The configure variable that contains the hwaccel defines from FFmpeg
is overwritten at successful detection. This way FFmpeg would contain
only the hwaccel of the last detected system.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36547 b3059339-0415-0410-9bf9-f77b7e298cf2
Add XvMC hwaccel defines to configure.
These would be needed for compilation when/if
XvMC hwaccel conversion is committed to FFmpeg.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36548 b3059339-0415-0410-9bf9-f77b7e298cf2
Switch from deprecated intfloat_readwrite.h to intfloat.h

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36549 b3059339-0415-0410-9bf9-f77b7e298cf2