Prefer objc_getClassList() for protocol injection
Prefer objc_getClassList() for protocol injection

This avoids an issue where protocol injection might invoke +initalize on SenTestCase (and subclasses thereof), causing tests to be run before injection has finished.

liuruxian/libextobjc,jiakai-lian/libextobjc,sandyway/libextobjc,KBvsMJ/libextobjc,goodheart/libextobjc,WPDreamMelody/libextobjc,kolyuchiy/libextobjc,bboyesc/libextobjc,sanojnambiar/libextobjc,sunfei/libextobjc,telly/libextobjc