Merge pull request #6366 from reitermarkus/depends_on-macos

Library/Homebrew/cask/dsl/depends_on.rb

Library/Homebrew/cask/installer.rb

Library/Homebrew/compat.rb

Library/Homebrew/compat/requirements/macos_requirement.rb

Library/Homebrew/dependency_collector.rb

Library/Homebrew/requirements.rb

Library/Homebrew/requirements/macos_requirement.rb

Library/Homebrew/requirements/maximum_macos_requirement.rb

Library/Homebrew/test/cask/depends_on_spec.rb

Library/Homebrew/test/cask/dsl_spec.rb

Library/Homebrew/test/requirements/macos_requirement_spec.rb

...ixtures/cask/Casks/compat/with-depends-on-macos-string.rb

...upport/fixtures/cask/Casks/with-depends-on-macos-array.rb

...t/fixtures/cask/Casks/with-depends-on-macos-comparison.rb

...port/fixtures/cask/Casks/with-depends-on-macos-failure.rb