Make `addCleanupBlock:` public
Make `addCleanupBlock:` public

Squirrel/Squirrel.Mac,emiscience/Squirrel.Mac,Squirrel/Squirrel.Mac,emiscience/Squirrel.Mac,EdZava/Squirrel.Mac,emiscience/Squirrel.Mac,EdZava/Squirrel.Mac,EdZava/Squirrel.Mac,Squirrel/Squirrel.Mac