Cactus build system has leftover support for F77 and linking with the C compiler

F77 has been replaced by F90 and all F77 options are set to their F90 ones in: e8f2db41 almost 5 years ago.

https://bitbucket.org/cactuscode/cactus/pull-requests/58/rhaas-cleanup/diff

This pull request remove some remnants of this from the flesh as well as changing the way the C/C++/F90 compiler is identified from looking at the executable name to looking at the output of the --version or equivalent command line option.

This helps in cases where: 1. the compiler is called gcc-8 instead of gcc 1. the full path to the compiler is given /usr/local/bin/gcc instead of gcc

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