Build PCRE2 on Windows

[HertzDevil]

Builds pcre2-8.lib and distributes it alongside pcre.lib for Windows packages.

This makes Crystal always prefer PCRE2 on Windows by default, because there is no pkg-config here.

[HertzDevil]

@straight-shoota feel free to include this patch as part of the new PCRE2 PR directly

[straight-shoota]

I rebased this on top of the new PR for PCRE2 (#12856). But it doesn't work as is.

In #12856 PCRE2 is not chosen by default. It's opt-in via -Duse_pcre2 for now. And for now we also shouldn't build the compiler with PCRE2. We're not doing that on other platforms yet either, and it affects the syntax of the language (#12857).

We could run regex specs against PCRE2 on windows. But I suppose the specs from #12856 should be sufficient for that. I don't expect different behaviour from PCRE2 on other platforms.

[straight-shoota]

Looks like this was claused automatically by merging #12856. No idea why. The target branch should've just rebased (as did #12866 (comment)).

[oprypin]

Yeah GitHub behaves weirdly.
Now what you can do is undelete the branch then manually change the base here

[straight-shoota]

This is so weird. But it works 🤷 Thanks @oprypin 👍