Abort if no Fortran compiler is available

When building with an automatically setup simfactory 2 on my laptop, I got very strange error messages such as "none not found" because I had no fortran compiler configured. These came from LAPACK and BLAS. I attach patches which check whether the Fortran compiler is available, and if not, to abort with a sensible error message. It also seems to me that the Fortran thorn should abort if there is no Fortran compiler is available, so I also attach a patch to do this.

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