RcppParallel 4.3.7
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* Add tbbmalloc library
* Add support for TBB on Solaris
* Fix failure to compile on OS X Snow Leopard R toolchain
* Correctly pass clang to TBB configure when R is using clang

RcppParallel 4.3.6
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* Support for TBB on Windows

RcppParallel 4.3.3
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* Update to TBB 4.3 (fixes clang compilation error in platform.h)
* Forward CXX to TBB Makefile

RcppParallel 4.2.5
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* Initial release
