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CheckFortranSource*: Avoid passing -DVAR to linker

Brad King requested to merge brad.king/cmake:CheckFortranSourceCompiles-def into master

The test project is compiled with a -DVAR compiler flag where VAR is the result variable. Tell try_compile to add the flag through add_definitions instead of CMAKE_Fortran_FLAGS so that it is not used for linking. Otherwise some Fortran compilers (e.g. XL 15) do not like the flag when used to drive linking.

Topic-rename: CheckFortranSource-def

Edited by Brad King

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