[Issue 19873] function should be by default @system even with -preview=dip1000

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19873

Walter Bright <bugzilla at digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Hardware|x86_64                      |All
                 OS|Linux                       |All

--- Comment #6 from Walter Bright <bugzilla at digitalmars.com> ---
https://github.com/dlang/dmd/pull/10898

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