Corinna Vinschen f8190b5705 * thread.h (struct pthread_rwlock::RWLOCK_READER): Add counter n.
* thread.cc (pthread_rwlock::rdlock): If a thread already owns a
	read lock, just count the number of locks for it, per SUSv4.
	(pthread_rwlock::tryrdlock): Ditto.
	(pthread_rwlock::unlock): If a thread has more than one concurrent
	read locks, just count down.
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