Use yaml from homebrew

[dreyks]

Homebrew is no longer located in /usr/local on Apple Silicon. It is now in /opt/homebrew. This leads to brew-originated yaml not being picked up during the build

We should probably manage yaml the same way we do it with readline. Looking at the code there's already a function that should do what is needed but it's not being called anywhere

ruby-build/bin/ruby-build

Lines 1029 to 1037 in cbdbc6e

	use_homebrew_yaml() {
	local libdir="$(brew --prefix libyaml 2>/dev/null || true)"
	if [ -d "$libdir" ]; then
	echo "ruby-build: using libyaml from homebrew"
	package_option ruby configure --with-libyaml-dir="$libdir"
	else
	return 1
	fi
	}

should we call it here?

ruby-build/bin/ruby-build

Lines 581 to 583 in cbdbc6e

	if [ "$package_var_name" = "RUBY" ]; then
	use_homebrew_readline || use_freebsd_pkg ||true
	fi

[mislav]

That's a good idea! Note that use_homebrew_yaml would have to get wrapped in this condition to prevent overriding user's explicit configuration:

if [[ "$RUBY_CONFIGURE_OPTS" != *--with-libyaml-dir=* ]]

[dreyks]

Yup, thx. I'll make a PR then

[dreyks]

done #1929