Ordinarily variable assignments in Makefiles are done simply with an
unconditional assignment: the equals sign.  There are variants of this:

FOO := $(BAR)	Avoid recursively expand variables.
FOO ?= bar	Assign only if $(FOO) is not already set.
FOO += bar	Add more to a variable.
FOO != bar	Execute a shell script and assign result to $(FOO).

See also
https://www.gnu.org/software/make/manual/html_node/Conditional-Example.html
https://www.gnu.org/software/make/manual/html_node/Flavors.html

brew test: more fixes for ARM

On ARMv7, the arch name is armv7l instead of armv7. So update the bottle
file name accordingly.

brew tests: fix for ARM

This ensures correct RUBY_PATH is used when running `brew tests` with
custom `HOMEBREW_RUBY_PATH`

More info: https://github.com/Homebrew/brew/pull/6617#discussion_r336431131

Fix `shellenv` when using `-u`.

doctor: list any uncommitted modified files in CI

Also fix the absolute link used by testball_bottle-0.1.intel_macintosh.bottle.tar.gz

Fix `#match?` on `nil`.

os/mac/xcode: fallback to clang version for detecting CLT.

For some reason `pkgutil --pkgs` no longer lists the CLT after the
Catalina supplemental update.

Fixes https://github.com/Homebrew/brew/issues/6610

vendor-install: Add ruby bottle for aarch64

bottle: do not install patchelf if --skip-relocation flag is passed

Skip quarantining symlinks.

Fix missing `command` method.

README: update maintainers.

Some arriving, some leaving.

build: bump rubocop from 0.75.0 to 0.75.1 in /Library/Homebrew

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.75.0 to 0.75.1.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop/compare/v0.75.0...v0.75.1

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Raise deprecation exceptions in tests

Previously tests which hit `odeprecated` would print warnings but not
always raise exceptions or fail. Combine this with the ability to have
`odeprecated` to turn into `odisabled` on certain dates and you have
tests that may fail just on the clock changing (this is bad).

Instead, ensure that tests always raise deprecations as exceptions so
that new deprecations will have their tests handled immediately.

Cask: only quarantine working symlinks

Fixes Homebrew/homebrew-cask#70796

Move condition to nested `if` statement.

Fix `Dmg` detection.

Bump Rubocop's `TargetRubyVersion` to 2.6 and fix all offenses