Mark T9208 as broken when debugging is on

this seems to be expected, as explained by SPJ in comment 7 of #9208.

testsuite/tests/stranal/should_compile/all.T

@@ -19,4 +19,4 @@ test('T1988', normal, compile, [''])
 test('T8467', normal, compile, [''])
 test('T8037', normal, compile, [''])
 test('T8743', [ extra_clean(['T8743.o-boot', 'T8743.hi-boot']) ], multimod_compile, ['T8743', '-v0'])
-test('T9208', normal, compile, [''])
+test('T9208', when(compiler_debugged(), expect_broken(9208)), compile, [''])