Fix macos-12 CI runner not being able to build gettext #1498
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When building gettext, Homebrew tries to upgrade all dependencies, and Python is somehow a downstream dependency and it fails link in certain binaries like 2to3 which GitHub's CI environment already installed separately. This is a messy situation in general, but to fix it, just set
HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK
so Homebrew doesn't go helpfully upgrade our dependencies when all we want is to build the package itself. For the most part it should not cause any issues.