Support AC-3 in Sega Dreamcast Sofdec files.

Fixes ticket #3184
Add an Opus and a Speex muxer.

Fixes ticket #3181.
avisynth: Move to av_new_packet/av_free_packet.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avisynth: make avs_library statically allocated.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
dynamic loading of shared faac library
avfilters: better behavior of frei0r on win32
programs: print version info and configuration only on -version
configure: fix modplug detection (it needs +lstdc++)
configure: temp hack to workaround new freetype2 headers
no Werror on implicit-function-declaration and missing-prototypes
custom icon and windows resource
use upstream version tag, my repo is always rebased