to the source tree, build it everytime with MSVC in SDL1.2 builds, and
remove SDLmain.lib. (see: http://stackoverflow.com/questions/30412951 )
git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@1376 af15c1b1-3010-417e-b628-4374ebc0bcbd