[gfortran] Change language name from "f95" to "fortran"

[FX Coudert]

Attached patch changes the name of the language in --enable-languages 
from "f95" to "fortran", and in a few other places. There are still lots 
of places which are refered to as f95 (such as f951 ;-), but they are 
all internal uses.

I'm not very familiar with the mechanism of language names, so I might 
have forgotten some changes. Built and regtested on i686-linux. Comments?

FX
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