[patch] [libcxx] _LIBCPP_NO_RTTI fix for g++.exe and cl.exe

[G M]

Hello Everyone

Attached is a patch that attempts to fix libcxx's detection of rtti
disablement for g++.exe and cl.exe. When RTTI is NOT enabled,
_LIBCPP_NO_RTTI is defined.

Though not related, this patch expects my previous patch for #warning will
be applied first as both patches  touch the same __config file.

Thanks
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