[PATCH] [libc++] Check the support of default function template args.

[Logan Chien]

GCC will generate an error if we uses default function
template arguments in pre-C++0x mode.  Besides,
Clang will generate a warning in pre-C++0x mode (though
it will be hidden by system_header pragma.)

http://llvm-reviews.chandlerc.com/D2384

Files:
  include/__config
  include/memory
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