Fix build break for zig 0.14.0-dev.2596

[nurpax]

• There's no root_module.addCMacro anymore

• There's also no root_module.unwind_tables boolean anymore. My fix only fixes the break but I don't know what's the right value to set here. The choices are null, sync, and async. I couldn't get the luajit variant to build on Windows. Maybe merge this and ask the luajit contributor for a proper fix?

for #130

[nurpax]

I think CI is not testing luajit. But at least my superficial attempt to look at it failed on Windows, so it might not work to enable it in the makefile with the current GitHub Actions config.

[efjimm]

The sync option for unwind_tables matches the behaviour as before. The build runner previously passed the -funwind-tables flag when unwind_tables was set to true, it now passes that same flag when unwind_tables is set to sync.

[nurpax]

Thanks! I'll update the PR to use sync.

[nurpax]

PR updated to use sync. This change is good to go as far as I'm concerned.

[freegamerskids]

This issue was partially fixed in #127, and already fully fixed in #129 (if needed, i can bump the zig version).

[nurpax]

I think this issue is still unresolved. Neither this nor the change mentioned above is in.

[nurpax]

@natecraddock AFAIC this PR is good to go. I checked that it also implements what was pointed out in the above comment but also adds some fixes to newer zig versions.

I also snuck in a new test for pushAny of an anonymous struct. I didn't see one in the existing tests, and that was the usage pattern in my code where I noticed these new breakages.

[natecraddock]

Hi! So sorry for the long delays and silence. Life has been crazy

Thanks for working on this