This solves warning C4005: '_NOEXCEPT' : macro redefinition when compiling
with Visual C++ 2013 by making libcxx definition text-identical to yvals.h.

Persumably this definition is for older Visual C++ versions. 
In such cases it will still be defined so no functionality change.

Other platforms should not be affected as this is inside
#elif defined(_LIBCPP_MSVC)

Patch by G M!



git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@201328 91177308-0d34-0410-b5e6-96231b3b80d8

include/__config

diff --git a/include/__config b/include/__config
index f33e25b..21f7dce 100644
--- a/include/__config
+++ b/include/__config
@@ -434,7 +434,7 @@
 #define _ALIGNAS(x) __declspec(align(x))
 #define _LIBCPP_HAS_NO_VARIADICS
 
-#define _NOEXCEPT throw()
+#define _NOEXCEPT throw ()
 #define _NOEXCEPT_(x)
 #define _NOEXCEPT_OR_FALSE(x) false