[PATCH] Upgrade libc++'s test's CMakeLists.txt to be in sync with libc++abi's

[Dan Albert]

================
Comment at: CMakeLists.txt:44
@@ +43,3 @@
+  DEPENDS cxx
+  ARGS ${LIT_ARGS}
+  )
----------------
As I read the implementation of `add_lit_testsuite` this will actually pass the args twice (`LLVM_LIT_ARGS` is passed implicitly, thank you, global scope!).

http://reviews.llvm.org/D7110

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