[testsuite/aarch64-darwin] disable T12674

(cherry picked from commit 08e50109)

testsuite/tests/driver/T12674/all.T

-test('T12674', [extra_files(['-T12674.hs', '-T12674c.c'])], makefile_test, [])
+test('T12674', [extra_files(['-T12674.hs', '-T12674c.c']),
+                when(opsys('darwin') and arch('aarch64'), skip)],
+                makefile_test, [])
 test('T12674w', [extra_files(['-T12674.hs', '-T12674c.c']),
                 unless(opsys('mingw32'), skip)],
                 makefile_test, [])