revert r962 and r963 (first attempt at multisampling)

git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk@965 af15c1b1-3010-417e-b628-4374ebc0bcbd
new fsaa support patch. commandline flag is -fsaa, cvar is vid_fsaa. cvar is only read in VID_Init, changing it prints a message that the new value will only be used upon restart

git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk@966 af15c1b1-3010-417e-b628-4374ebc0bcbd