Ensure dimensions are set before opening libavcodec encoder.

This is a requirement that was added some time ago, we
so far relied on a hack in libavcodec, but that isn't
really a good idea.
Only lightly tested.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@37239 b3059339-0415-0410-9bf9-f77b7e298cf2
linux: controlled CreateFile() in win32 loader

it allows e.g. two pass encoding using vp6vfw.dll
af: winamp dsp audio filter
af: runtime equalizer
win32: added vo native directshow decoder
make fontconfig spam while creating font cache
win32: color console
audio: disable muting audio at exit on win32, mplayer somehow crashes
win32: color term osd
win32: disable_system_conf defaults to 1 on win32
win32: filename glob() + unicode
stream_cddb: fix include path on MinGW-w64
vcd support on MinGW-w64
qtx: qtx decoder spams on stdout and causes problems while piping streams
mpcodecs: make faac encoder dynamic load faac library at runtime
input: map control keys using human readable strings
input: avoid spam when pressing an unknown key
configure: reduced some warnings on gcc flags
configure: enabled support for libmodplug in lavf
configure: enabled support for libfdk-aac in lavc