* oslibs (macosx, windows):
- recompile FLAC decoder with a fix for free-ing of unitilialized
  pointer (flac git, commit 18a4854)
* recompile opus decoder with a fix for avoiding undefined behavior
  (signed arithmetic overflow) or implementation-defined behavior
  (malloc(0)) on out-of-range arguments (opus git, commit 25b27a9)


git-svn-id: svn+ssh://svn.code.sf.net/p/quakespasm/code/trunk@1148 af15c1b1-3010-417e-b628-4374ebc0bcbd