message: Avoid building test on Linux that isn't run there.
  rdar://problem/40437419
diff: @@ -18,10 +18,10 @@ class TestMissingSDK(TestBase):
  def setUp(self):
  # Call super's setUp().
  TestBase.setUp(self)
  - self.build()
  @skipIf(oslist=['linux', 'windows'])
  def testMissingSDK(self):
  + self.build()
  exe = self.getBuildArtifact("a.out")
  # Create a target by the debugger.
  