Avoid free call in interpreted mode

[straight-shoota]

This is a workaround for an interpreter bug (#12495) and basically restores the status before #12456.

[asterite]

But for this we also need to bind free and the others to the GC. Otherwise memory will leak.

[straight-shoota]

Yes. But this didn't happen in interpreted mode before #12456 either, so we're just reverting to that state.

crystal/src/regex/lib_pcre.cr

Lines 32 to 36 in e0310b6

	# TODO(interpreted): remove this unless
	{% unless flag?(:interpreted) %}
	LibPCRE.pcre_malloc = ->GC.malloc(LibC::SizeT)
	LibPCRE.pcre_free = ->GC.free(Void*)
	{% end %}

[straight-shoota]

Hm, interpreter specs still fail: https://github.com/crystal-lang/crystal/actions/runs/3078461887/jobs/4974034000

[straight-shoota]

Doh 🤦 It's flag?(:interpreted), not flag?(:interpreter). I think I've fallen to that footgun before.