[Bug 223678] devel/cmake: find_package(OpenMP) doesn't find the openmp package (when base clang compiler is used)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223678

--- Comment #24 from Adriaan de Groot <adridg at freebsd.org> ---
A couple of things need(ed) doing:
 - -fopenmp also needs to be passed as a link flag for all variants
 - -L needs to be passed to base clang
 - -I needs to be passed to base clang

With a non-base clang, CMake will report
-- Found OpenMP_C: -fopenmp=libomp (found version "3.1")

With base clang and devel/openmp, CMake will report:
-- Found OpenMP_C: -fopenmp=libomp -I/usr/local/include -L/usr/local/include
(found version "3.1")

Suitable subsets of those flags are set on the exported target for "Modern"
usage. I'll update the attachements (module and diff) in a few minutes.

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