oslibs (macosx, windows): recompile libFLAC with malformed

vorbiscomment handling improvements from git and with a fix
for windows vsnprintf().


git-svn-id: svn+ssh://svn.code.sf.net/p/quakespasm/code/trunk@1068 af15c1b1-3010-417e-b628-4374ebc0bcbd

quakespasm/MacOSX/codecs/include/flac_config.txt

@@ -0,0 +1,3 @@
+FLAC v1.3.0 release + several fixes from the flac git repo at xiph.org.
+Decoder-only functionality, which is what we need: the encoder stuff is
+left out of the build.

quakespasm/Windows/codecs/include/flac_config.txt

@@ -0,0 +1,3 @@
+FLAC v1.3.0 release + several fixes from the flac git repo at xiph.org.
+Decoder-only functionality, which is what we need: the encoder stuff is
+left out of the build.