* dcrt0.cc (dll_crt0_1): Add call to pthread::initMainThread to
initialize mainthread when it is safe to call new.
* init.cc (dll_entry): Change call to store reents in tls key.
* thread.cc (_reent_clib) : Change call to get reents from tls
key.
(_reent_winsup): Ditto.
(MTinterface::Init): Key handling changed. Remove initialization
of member variables.
(MTinterface::fixup_after_fork): Reinitialize mainthread object
after fork. Reset threadount to 1.
(pthread::initMainThread): Create mainthread object dynamically.
and initialize with valid handles.
(pthread::self): Remove calls to create thread objects.
(pthread::setTlsSelfPointer): Change call to store thread self
handle in tls key.
(pthread::getTlsSelfPointer): New static method.
(pthread::exit): Remove setTlsSelfPointer call.
(pthread::initCurrentThread): New method.
(pthread::thread_init_wrapper): Change call to store thread self
handle in tls key.
(pthread::join): Check for a valid joiner.
(pthreadNull::pthreadNull): Mark Null object as detached.
(pthreadNull::exit): Terminate thread via ExitThread.
* thread.h (pthread::initMainThread): Change parameter in function
call.
(pthread::getTlsSelfPointer): New static method.
(pthread::initCurrentThread): New method.
(MTinterface::reent_key): Remove.
(MTinterface::thread_self_dwTlsIndex): Ditto..
(MTinterface::indexallocated): Ditto.
(MTinterface::mainthread): Ditto.
(MTinterface::reent_key): New member.
(MTinterface::thread_self_key): Ditto.
(MTinterface::MTinterface): Initialize all members.
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