Speedburst/Speedhack/Z-Fighting/libjpeg/conback etc problems resolved within
mingwcross compiled binaries with removal of -O6 and -funroll-loops optimizations.
Added static libraries and headers to their own directory:
libjpeg, libpng, zlib and libogg (ogg support not ready)
git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@2740 fc73d0e0-1445-4013-8a0c-d673dee63da5
