[CMake] Fortran MinGW on Windows

[Leek, Jim]

>> * Can you post a complete source example where it fails?
>> 
>> What would you like exactly?  Do you want me to make a reproducer?

>Ideally we'd like a minimal example that re-produces the failure.

Sheesh, I spent a bunch of time on a reproducer, but it doesn't build on Linux either.  My guess is that the lapack library I'm using on Linux brings in the necessary Fortran functions somehow.  Either because they got linked in, or by being dynamically linked itself.  Anyway, it suggests that this isn't exactly a cmake issue.

Jim