Deprecated callStructDtorsDuringGC

[JinShil]

Supersedes #2513

cc @rainers @edi33416 @andralex

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[andralex]

I'm all for this. @atilaneves ?

[rainers]

LGTM, but if you want this in 2.088, you'll have to target stable.

[JinShil]

Now targeting stable

[thewilsonator]

I'm assuming that the build kite phobos failure is bogus given that the autotester passes.

[atilaneves]

I was going to say "fine by me as well" but it's already been merged anyway.