doctor: check for beta XQuartz releases

Beta versions of XQuartz have address sanitization enabled, which
breaks some software at runtime, including wine.

Closes Homebrew/homebrew-core#2481.

Closes #459.

Signed-off-by: Misty De Meo <mistydemeo@github.com>

Library/Homebrew/extend/os/mac/diagnostic.rb

@@ -312,6 +312,18 @@ module Homebrew
             https://xquartz.macosforge.org
         EOS
       end
+
+      def check_for_beta_xquartz
+        return unless MacOS::XQuartz.version.include? "beta"
+
+        <<-EOS.undent
+        The following beta release of XQuartz is installed: #{MacOS::XQuartz.version}
+
+        XQuartz beta releases include address sanitization, and do not work with
+        all software; notably, wine will not work with beta releases of XQuartz.
+        We recommend only installing stable releases of XQuartz.
+        EOS
+      end
     end
   end
 end

Library/Homebrew/test/test_diagnostic.rb

@@ -226,4 +226,9 @@ class DiagnosticChecksTest < Homebrew::TestCase
       end
     end
   end
+
+  def test_check_for_beta_xquartz
+    MacOS::XQuartz.stubs(:version).returns("2.7.10_beta2")
+    assert_match "The following beta release of XQuartz is installed: 2.7.10_beta2", @checks.check_for_beta_xquartz
+  end
 end