FindBoost: Add support for -clangNN variant names

This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

If boost libraries are built with clang, their compiler name ends up being clang-darwin instead of xgcc. Because of this, the script fails to locate them.

Same problem with a selfcompiled clang 3.3 on windows. The boost library files are named libboost-*-clang33-*.lib.

Setting

SET(Boost_COMPILER "-clang33")

works around the problem.

Edited Dec 21, 2017 by Brad King

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