Updated mediawiki/extensions
Project: mediawiki/extensions/GlobalBlocking  37b6c1ff55b0b341c4c2a163850c9e0711b5b971

Add the GlobalBlockingHooks class

In order to pull this code out of the messy,
multi-purpose GlobalBlocking class.

Change-Id: I71871281a27e7f137c022ed7e53433df7f7213d0