Fixed INIT_LOCK() on Android by casting to pthread_mutex_t. 

Based on David's suggestion: http://lists.gnu.org/archive/html/gnustep-dev/2013-03/msg00082.htm


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/libobjc2/trunk@36465 72102866-910b-0410-8b05-ffd578937521