Flag unsupported declare() directives

[weirdan]

https://psalm.dev/r/e8203450a1 - I'd expect it to be flagged due to the typo in strict_types (missing s).

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/e8203450a1

<?php declare(strict_type=1);

Psalm output (using commit 96d8394):

No issues!