Shoaib Meenai 03e314bb0d [libc++] Account for Microsoft CRT const overloads
Microsoft's CRT already provides the const overloads, and it defines the
`_CRT_CONST_CORRECT_OVERLOADS` macro to indicate their presence. Check
for this macro before attempting to define our own const-correct
overloads, to avoid compiler warnings about casts dropping const
qualifiers.

llvm-svn: 313377
2017-09-15 18:49:34 +00:00
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