removed helper cmake macro and don't use deprecated COMPILE_FLAGS anymore.

Erik Schultheisrequested to merge
ngc92/eigen:cmake2 into master

This is a first attempt at starting to clean up the cmake scripts. It replaces manual manipulation of (deprecated) COMPILE_FLAGS with target_compile_options and target_compile_definitions instead. I don't have a SYCL/HIP version available here, so I haven't tested that part.

Q: Should we (in a separate MR) define an interface target for the common test flags and then just target_link_libraries with those instead of adding all these options inside ei_add_test_internal?

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