[libc++] Fix GCC 7.2.0 macro redefinition warning
The warning happens when LIBCXX_ENABLE_EXCEPTIONS cmake option is not set, and it fires every time __config is included, 33 in total. Patch by Jason Lovett Reviewed as https://reviews.llvm.org/D49997 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@338531 91177308-0d34-0410-b5e6-96231b3b80d8
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