Changeset 9839:4f59390d8dfc
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scons: Enable build on OSX

This patch changes the SConscript to build gem5 with libc++ on OSX as
the conventional libstdc++ does not have the C++11 constructs that the
current code base makes use of (e.g. std::forward).

Since this was the last use of the transitional TR1, the unordered map
and set header can now be simplified as well.

Compiled on OSX 10.8.4 using clang