ENH: This adds new compiler specific flags
ENH: This adds new compiler specific flags

Compiler flags are optionally set for usign clang on
linux with different glibc versions.

These flags have been migrated from the makefile to
the CMakeLists.txt file.

This resolves #18.

Formlabs/tbb,Formlabs/tbb,wjakob/tbb,wjakob/tbb,wjakob/tbb,wjakob/tbb,wjakob/tbb,Formlabs/tbb,Formlabs/tbb,Formlabs/tbb,wjakob/tbb,Formlabs/tbb,Formlabs/tbb,wjakob/tbb