[Bug fortran/102638] Add warning for implicit save

[vivekrao4 at yahoo dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102638

--- Comment #1 from Vivek Rao <vivekrao4 at yahoo dot com> ---
I meant to say that -Wimplicit-save would be part of -Wall *or* -Wextra.