src: Only use the TR1 type_traits when targeting OSX<10.9#7778
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Checklist
make -j4 test(UNIX), orvcbuild test nosign(Windows) passesAffected core subsystem(s)
src
Description of change
Mac OSX 10.9 has switched to using libc++ by default. libc++
provides a C++11 <type_traits> implementation, so we only need
to use the TR1 version when targetting OSX 10.8 or 10.7.
This patch fixes build failures when using
-mmacosx-version-min=10.9to build Node.