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(enum _SEMAPHORE_INFORMATION_CLASS): Define. (NtQuerySemaphore): Declare. * thread.h (class semaphore): Add member startvalue. (semaphore::fixup_before_fork): New inline method. (semaphore::_fixup_before_fork): Declare. * thread.cc (MTinterface::fixup_before_fork): Additionally call semaphore::fixup_before_fork. (semaphore::semaphore): Set currentvalue to -1. Set startvalue to incoming initializer value. (semaphore::_getvalue): Just query semaphore using NtQuerySemaphore rather then using WFSO/Release. (semaphore::_post): Drop setting currentvalue. It's not thread-safe. (semaphore::_trywait): Ditto. (semaphore::_timedwait): Ditto. (semaphore::_wait): Ditto. (semaphore::_fixup_before_fork): New method, setting currentvalue from actual windows semaphore right before fork. (semaphore::_fixup_after_fork): Drop kludge from 2013-07-10. Drop FIXME comment.
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