* pthread.cc (pthread_mutex_init): Use new pthread_mutex::init.
* thread.cc: Change __pthread_mutex_init to pthread_mutex::init
throughout.
(MTinterface::Init): Initialise pthread_mutex support.
(pthread_mutex::mutexInitializationLock): Instantiate.
(pthread_mutex::initMutex): New method.
(__pthread_cond_dowait): Don't dereference untrusted pointers.
Use the new pthread_mutex::init method.
(__pthread_condattr_init): Don't dereference untrusted pointers.
(__pthread_mutex_init): Rename to pthread_mutex::init.
Lock and release mutexInitializationLock to prevent races on
mutex initialisation.
* thread.h (pthread_mutex::initMutex): New method, initialise
pthread_mutex supporting state on process initialisation.
(pthread_mutex::init): Initialise a single mutex.
(pthread_mutex::mutexInitializationLock): A win32 mutex for
syncronising pthread mutex initialisation.
(__pthread_mutex_init): Remove this.
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