git-artifacts: don't add ARM64-specific workaround for GCM Core in skipped jobs

[dscho]

In skipped jobs, the arm64/ directory does not exist, which would make this task fail: https://github.com/dscho/git/runs/2214202079?check_suite_focus=true

Cc: @dennisameling

[dscho]

@dennisameling speaking of that build, could I bother you to verify that the MinGit artifact from that build works? I am particularly interested in verifying that #3151 does not break anything. So if you could test that git-shell.exe and git.exe do run correctly, whether run from bin/ or from libexec/git-core/, that would be lovely!

[dennisameling]

@dscho sorry for the late reply, have been swamped with work lately. Please give me a few days to test #3151 and get back to other things here!

[dennisameling]

@dscho alright, finally got to testing the ARM64 MinGit artifact from #3151 😊 All looking good:

PS C:\Users\denni\Downloads\mingit-arm64\arm64\bin> .\git.exe version
git version 2.31.1.GIT
PS C:\Users\denni\Downloads\mingit-arm64\arm64\bin> .\git-shell.exe
git>
PS C:\Users\denni\Downloads\mingit-arm64\arm64\libexec\git-core> .\git.exe version
git version 2.31.1.GIT
PS C:\Users\denni\Downloads\mingit-arm64\arm64\libexec\git-core> .\git-shell.exe
git>

Once again sorry for the delay!

[dscho]

Thanks for testing!