Rebuild: gargammel[subdir=osx-64]

[mbargull]

gargammel: build on CircleCI for osx (fails with macOS 10.15 on GitHub Actions)

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[bgruening]

not sure wh 2, but it also does not hurt :)

[mbargull]

Because some dummy didn't merge bulk into master yet :O. Once I get those builds (and their downstream packages) I'll finally merge bulk again.