gcc: Update copyright year.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
gcc: add -fsigned-bitfields and its opposite.

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

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
gcc: add basic Objective C options.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
gcc: cover setjmp/longjmp exceptions.

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