Mark #6132 as broken on OS X

It currently fails with,

    =====> T6132(normal) 1 of 1 [0, 0, 0]
    cd "./runghc/T6132.run" && "/Users/bgamari/ghc/inplace/test
    spaces/ghc-stage2" -c T6132.hs -dcore-lint -dcmm-lint
    -no-user-package-db -rtsopts -fno-warn-missed-specialisations
    -fshow-warning-groups -dno-debug-output
    Compile failed (exit code 1) errors were:

    T6132.hs:1:2: error: parse error on input ‘#!/’

    *** unexpected failure for T6132(normal)

testsuite/tests/runghc/all.T

@@ -7,7 +7,7 @@ test('T8601', req_interp, run_command,
 test('T11247', [req_interp, expect_broken(11247)], run_command,
      ['$MAKE --no-print-directory -s T11247'])
 
-test('T6132', [], compile, [''])
+test('T6132', [when(opsys('darwin'), expect_broken(6132))], compile, [''])
 
 test('T-signals-child',
      [when(opsys('mingw32'), skip), req_interp],