merges r21105 and r21106 from trunk into ruby_1_9_1.

* thread.c (mutex_free): GC thread (main thread) has failed to unlock
  a mutex that is locked by another thread, which makes the mutex
  dangling in keeping_mutexes and causes [BUG] or stuck finally.
  Now unlocking is performed as locking thread.

* thread.c (mutex_unlock, rb_mutex_unlock, rb_mutex_unlock_all):
  mutex_unlock receives a thread.

git-svn-id: http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_9_1@21132 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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