Removes a bunch of win32 ifdefs

git-svn-id: svn://svn.icculus.org/fs2open/branches/antipodes@10149 387891d4-d844-0410-90c0-e4c51a9137d3
From m!m: Enables FRED building. IMPORTANT NOTE: This requires a patched libsdl, the patch is included in the libsdl directory. Binaries were provided by m!m.

git-svn-id: svn://svn.icculus.org/fs2open/branches/antipodes@10151 387891d4-d844-0410-90c0-e4c51a9137d3
Derp, forgot to remove testing stuff.

git-svn-id: svn://svn.icculus.org/fs2open/branches/antipodes@10152 387891d4-d844-0410-90c0-e4c51a9137d3