Fix possible endless loop in VM_sprintf.

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@12100 d7cf8633-e32d-0410-b094-e92efae38249
In current gccs, it is -mfpmath=sse, not -fpmath=sse.

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@12101 d7cf8633-e32d-0410-b094-e92efae38249