* 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://svn.code.sf.net/p/uhexen2/code/trunk@5368 eaf649e6-6c13-0410-b194-84221022858e
added cross-build scripts for targetting morphos

git-svn-id: svn://svn.code.sf.net/p/uhexen2/code/trunk@5369 eaf649e6-6c13-0410-b194-84221022858e