Explicitly mark compareLayer as __cdecl

[jenatali]

There's command-line switches which can change the default calling convention for unannotated functions. Visual Studio defaults to /Gd which is __cdecl, but Windows defaults to /Gz which is __stdcall. That causes an x86 build break, since qsort requires the input parameter to be __cdecl. Just add the explicit annotation so it works regardless of the default.

[jenatali]

Looks like the CI run hit an infrastructure issue (timeout retrieving GPG key). I don't see an option to re-run it but I'm not super familiar with the GitHub actions UI. Might just be a permission issue though.

[Kerilk]

Launched a rerun of the failed jobs.

[Kerilk]

@bashbaug @MathiasMagnus Do we want to add the above configuration to the CI? Or merge this as is and try to remember about this?

[MathiasMagnus]

This seems like a good change. We should probably test both calling conventions, but I'd defer it via an issue of its own.

[bashbaug]

I added an issue to track adding this case to CI, so we don't lose track of it. Let's just merge this now.