Actually add Multi-Arch: same to -dbgsym packages

Peter Pentchevrequested to merge
roam/debhelper:1121566-dbgsym-m-a-same into main

Hi,

First of all, thanks a lot for maintaining debhelper!

In my analysis of #1121566 I realized that the reason the libzstd1-dbgsym:{amd64,i386} packages were not co-installable is that they are not marked as Multi-Arch: same, even though libzstd1 itself is. What do you think about this change that attempts to fix it?

Of course, if you think the change ought to be made somewhere else, e.g. in dh_gencontrol_automatic_substvars(), let me know and I can do it. Of course, as the maintainer it's also your call as to whether this is the correct approach at all.

Thanks again, and keep up the great work!

G'luck, Peter

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