space separated EIGEN_TEST_CUSTOM_CXX_FLAGS

Erik Schultheisrequested to merge
ngc92/eigen:space-separated-args into master

Convert spaces in EIGEN_TEST_CUSTOM_CXX_FLAGS into ; to make this a CMake List. This is using the MODE version of separate_arguments because this respects escapes and quotes.

Interestingly, at this point I think EIGEN_TEST_CUSTOM_LINKER_FLAGS does not need this processing. I think this is because we are using still using the legacy way of specifying target_link_dependencies without PUBLIC/PRIVATE specifier.

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