Fix issue 20853 - static array ptr cannot be used in safe code but it…

[dkorpel]

… should be allowed

The suggestion in the error message "use &b[0] instead" is non very useful on 0-size static arrays, that could still be improved.

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Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	20853	enhancement	static array ptr cannot be used in safe code but it should be allowed

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#13944"

[maxhaton]

@dkorpel changelog?

[dkorpel]

@dkorpel changelog?

It's a trivial change and it has a bugzilla issue.