For now, we need to duplicate this code in osapi.cpp and osapi_unix.cpp, so that Mac and Unix can compile

git-svn-id: svn://svn.icculus.org/fs2open/branches/antipodes@10101 387891d4-d844-0410-90c0-e4c51a9137d3
Support SDL2 bindings and SDL2.framework on Xcode4/5. Please remember to delete your projects/Xcode4/Frameworks/ folder and recreate from the modified projects/Xcode4/Frameworks.tgz

git-svn-id: svn://svn.icculus.org/fs2open/branches/antipodes@10102 387891d4-d844-0410-90c0-e4c51a9137d3
Ensure the SDL2.framework is copied into the final application bundle

git-svn-id: svn://svn.icculus.org/fs2open/branches/antipodes@10103 387891d4-d844-0410-90c0-e4c51a9137d3