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

[Dan Albert]

================
Comment at: CMakeLists.txt:17
@@ -16,3 +15,1 @@
 
-  set(LIT_ARGS_DEFAULT "-sv --show-unsupported --show-xfail")
-  if (MSVC OR XCODE)
----------------
We probably want to keep the configuration for the default args (and the assignment to `LLVM_LIT_ARGS`).

http://reviews.llvm.org/D7110

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