[Issue 13568] refactor std.format to eliminate redundant dependencies if the format string doesn't ask for it

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=13568

Walter Bright <bugzilla at digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://issues.dlang.org/sh
                   |                            |ow_bug.cgi?id=3248

--