Revert "lsyncd: use MACOS_FULL_VERSION"

This reverts commit 0f60f76f.

Library/Homebrew/cmd/audit.rb

@@ -813,10 +813,9 @@ class FormulaAuditor
       problem "Use MacOS.version instead of MACOS_VERSION"
     end
 
-    # TODO: comment out this after core code and formulae separation.
-    # if line =~ /MACOS_FULL_VERSION/
-    #   problem "Use MacOS.full_version instead of MACOS_FULL_VERSION"
-    # end
+    if line =~ /MACOS_FULL_VERSION/
+      problem "Use MacOS.full_version instead of MACOS_FULL_VERSION"
+    end
 
     cats = %w[leopard snow_leopard lion mountain_lion].join("|")
     if line =~ /MacOS\.(?:#{cats})\?/