Build does not detect compiler dependent Fortran symbol naming

[andrewreisner]

The MSG library uses preprocessor definitions to call Fortran routines based on compiler dependent naming rules. The build system needs to detect these naming rules and set the definitions appropriately. This is not needed for the Fortran kernels since Fortran 2003 interoperability was used.

[andrewreisner]

The following is a relevant CMake module:

https://cmake.org/cmake/help/v3.0/module/FortranCInterface.html