we don't need to cast because mod is a float

git-svn-id: svn://svn.icculus.org/fs2open/trunk@11124 387891d4-d844-0410-90c0-e4c51a9137d3
xt branch: tweaks to vecmat.cpp

git-svn-id: svn://svn.icculus.org/fs2open/trunk@11125 387891d4-d844-0410-90c0-e4c51a9137d3
xt branch: optimizations in fvi.cpp

git-svn-id: svn://svn.icculus.org/fs2open/trunk@11126 387891d4-d844-0410-90c0-e4c51a9137d3