FindOpenMP doesn't find OpenMP on current macOS

It looks like the tests in FindOpenMP.cmake are not running and finding OpenMP on macOS because they are missing the /usr/local/include directory.

The proper fix would be to add a search for omp.h and then use that include directory in the targets, and that would also fix #18098 (closed) and could fix #17474.

Edited Oct 18, 2018 by Henry Schreiner

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