gcc: expand -std to include Fortran.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
gcc: add -Wcast-qual.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
gcc: add -Wbad-function-cast.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
gcc: add -Wc++-compat entry.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
gcc: add -Wc++0x-compat and -Wc++11-compat.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
gcc: add -Wchar-subscripts.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>