GA small fix: Force cross-compilation for mac x86_64 on arm64 runners, under Intel emulation

[rwxayheee]

@joanimato Thanks for the fixes for GA. One minor problem with #385 was that both of the mac artifacts (from the arm64 and x86_64 workflows) have the arm64 architecture. This PR forces cross-compilation for the mac x86_64 executables to happen on arm64 runners, under Intel emulation.

Please take a quick look at the small changes and let me know if I'm doing the right thing. I will add the complied executables to the release tab, once this is merged

[joanimato]

Thanks. As long as the tests pass, this is fine by me.

[rwxayheee]

@joanimato Thanks!! I will take a second look at the failed builds on ubuntu. Sorry I didn't run all tests when I was testing it..

[rwxayheee]

I have the same PR in my fork with all checks passing here: https://github.com/rwxayheee/AutoDock-Vina/actions/runs/13149470972/job/36694214446?pr=7

I will rerun the Git Actions for this PR and make changes as needed

[rwxayheee]

In the first GA run, there was an unexpected segmentation fault during compilation for matrix.os == 'ubuntu-latest' && matrix.arch != 'x86_64'. But this is passing in the rerun, so the problem might be momentary.. Not changing the ubuntu workflows.

@joanimato If I could have your approval, I will be merging and adding the artifacts from this GA run to the release tab. Thanks again for taking care of this and the repo

[joanimato]

Looks good.