meson: switch to cc.get_supported_arguments

This is generally faster, as meson is able to parallelize the checks for
us.

This also removes the workaround for checking gcc/clang -Wno-*
arguments, which meson now handles internally so we don't need to handle
it ourselves.

Signed-off-by: Dylan Baker <dylan@pnwbakers.com>
Reviewed-by: Simon Ser <contact@emersion.fr>