[Bug libfortran/93550] Implement control of leading zero in formatted numeric output

[jvdelisle at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93550

--- Comment #4 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
The LEADING_ZERO specifiers are now included in the 2023 standard, so away we
go! In support of lazy programmers lets make the compiler do it. ;)