15dbb0be58
General: - Rename `unusable_ruby` to `need_vendored_ruby` (due to code changes). **`setup-ruby-path`** function: - Move `-z "$HOMEBREW_RUBY_PATH"` and `-n "$HOMEBREW_FORCE_VENDOR_RUBY"` checks to `need_vendored_ruby`. **`need_vendored_ruby`** function: - Check `HOMEBREW_FORCE_VENDOR_RUBY` first so that it's respected even on Macs that are "new enough" (`HOMEBREW_MACOS_SYSTEM_RUBY_NEW_ENOUGH` is set). - Don't check `-n $HOMEBREW_RUBY_PATH` because it is implicitly tested by `test_ruby`. - Remove (now-) redundant `-z $HOMEBREW_FORCE_VENDOR_RUBY` check as it is tested earlier in the conditional.
Library
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