Support OpenACC with Cray compiler + use OpenACC_Fortran_FLAGS #225
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The Atlas ACC feature was not working on Cray compilers because only the Fortran compiler supports OpenACC. This means that functions like
acc_map_datawith Cray could only be called via C-bindings.This PR adapts 'atlas_acc_support` library to use C-bindings to a Fortran implementation when the C++ compiler ID is not "NVHPC".
Additionally some cleanup of the use of OpenACC_Fortran_FLAGS is done.