Create gstreamer-1-bison-3.patch

Fixes #575.
xz: update
openal: fixes compilation on shared target.

The patch should only remove the "common" link, not both. Winmm is linked with this EXTRA_LIBS. Many undefined references fixed.

Here is the log: http://pastebin.com/iA6Mku2g
Merge pull request #592 from GuilhermeBernal/patch-2

openal: fixes compilation on shared target.
libpng: update
Merge branch 'stable'
Add MSYS2 to the list of related projects

See also: https://lists.nongnu.org/archive/html/mingw-cross-env-list/2014-12/msg00019.html
Merge branch 'stable'