configure: Refactor filtering libav* components into a function

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@35921 b3059339-0415-0410-9bf9-f77b7e298cf2
win32: color console
af: winamp dsp audio filter
win32: display played filename in console/video window
win32: added vo native directshow decoder
af: runtime equalizer
input: map control keys using human readable strings
replaced some signed char with unsigned char to fix some subtitle related problems
mpcodecs: make faac encoder dynamic load faac library at runtime
make fontconfig spam while creating font cache
audio: disable muting audio at exit on win32, mplayer somehow crashes
qtx: qtx decoder spams on stdout and causes problems while piping streams
input: avoid spam when pressing an unknown key
win32: color term osd
win32: force memalign on each alloc to avoid problems with sse code
configure: reduced some warnings on gcc flags
dvdnav: added dvdnav/dvdread submodules
conf: honor disable_system_conf (except stream_dvb)
win32: disable_system_conf defaults to 1 on win32
configure: added --with-arch and --with-tune overrides