Added f and m flags to be ignored. These will not display a warning. The revision

for this patch is here: http://reviews.llvm.org/D4570. This will help with the
rebuild of Debian with clang. Here is a link to the errors that Debian is
experiencing: http://clang.debian.net/status.php?version=3.4.2&key=UNKNOWN_ARG

llvm-svn: 214907