Fortran: compiler standard detection message verbosity like C

CMake supported compilers support Fortran 95+; more typically Fortran 2003+. Therefore, printing a message that Fortran 90 works each CMake configure is a bit like printing that C89 or C99 is supported for C compilers, which is not done.

We should make the Fortran 90 test the default, not bothering to test Fortran 77 support. This saves configure time, which is even more impactful on Windows systems. This is done in !6150 (closed), which would supersede this MR if chosen.