MSYS2 (MinGW-w64) static build issue

[Arukata]

Resulting binaries fail to start due to a dependency on "avcodec-56.dll", which is not generated. Adding -static to cflags etc didn't help. Shared builds function fine, despite that no additional libraries are present in this case either.

ffmpeg is otherwise installed via MSYS2's package manager. Possible this is user error that I'm just not realizing.

Also, stripping debug symbols fails ("can't rename [binary], already exists") if make clean is not run between builds. Didn't seem important enough for a separate ticket, might be an msys2 problem.

./configure --enable-avisynth --enable-chromaprint --enable-fontconfig --enable-ladspa --enable-libass --enable-libbluray --enable-libcaca --enable-libcelt --enable-libcdio --enable-libdcadec --enable-libfaac --enable-libfreetype --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libssh --enable-libtesseract --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-openal --enable-opengl --enable-openssl --enable-gpl --enable-nonfree --enable-version3

[Carl Eugen Hoyos]

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