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Fortran: Add support for submodules on Cray

Willem Deconinck requested to merge wdeconinck1/cmake:feature/fortran-submodule-fallback into master

Cray Fortran does not include the enclosing module name as a prefix of submodules. Define CMAKE_Fortran_SUBMODULE_SEP with an empty string to mean that there is no prefix, and set this for Cray.

Also add a default fallback to use the .mod extension when CMAKE_Fortran_SUBMODULE_EXT is not set. This is a better guess than no extension at all.

Issue: #18925
Topic-rename: fortran-submodule-cray

Edited by Brad King

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