make FC or FCC to specify the Fortran compiler

[tueda]

The manual says:

In case the Fortran comiler isn’t found, try make FC=<path-to-gfortran> smodels or make FC=<path-to-gfortran> externaltools.

This works for Pythia 6 but does not work for NLL-fast because the latter is compiled with FCC:

https://github.com/SModelS/smodels/blob/ce58a1f6647798267271bca7c7cd05aac4ae6298/smodels/lib/nllfast/nllfast-1.2/Makefile#L1-L7

https://github.com/SModelS/smodels/blob/ce58a1f6647798267271bca7c7cd05aac4ae6298/smodels/lib/nllfast/nllfast-2.1/Makefile#L1-L7

https://github.com/SModelS/smodels/blob/ce58a1f6647798267271bca7c7cd05aac4ae6298/smodels/lib/nllfast/nllfast-3.1/Makefile#L1-L7

A trivial workaround is to specify both:

make FC=/path/to/fortran FCC=/path/to/fortran externaltools

but it would be nice to unify the use of only FC or FCC if there is no particular reason.

[WolfgangWaltenberger]

Thanks, fixed it now (and adapted the docs) in the develop branch, which should be released soon. Will use FCC only.