- used dllexport/dllimport or visibility attributes when building vorbis
- applied commit 14920bae03 from xiph.org ogg git repo
- applied commit e5b1378996 from xiph.org vorbis git repo
git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@1421 af15c1b1-3010-417e-b628-4374ebc0bcbd
also updated the SDL library to HG/1.2 branch 2011-10-14 with
patch from http://bugzilla.libsdl.org/show_bug.cgi?id=1254#c15.
git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@497 af15c1b1-3010-417e-b628-4374ebc0bcbd