[Bug fortran/98053] Add Fortran tests for behavior from environment variables

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98053

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
           Priority|P3                          |P5
   Last reconfirmed|                            |2020-12-11
             Status|UNCONFIRMED                 |NEW