On OpenThreads win32 implementation we unconditionally unlock a mutex in the
destructor. That happens even if the mutex was not locked before.
When running a osg application within microsofts application verifier, that
software checks tells me that we should not unlock an unlocked mutex.
When I look at the posix threads mutex implementation, which does no unlock in
the destructor and where it is illegal to destroy a locked mutex, I conclude
that it is not needed for an OpenThreads::Mutex to do that unlock in the
win32 Mutex destructor.
Thus this patch based on rev 9358 removes that additional unlock in the win32
mutex implementations destructor."
This change has been done to make it easier for OpenSceneGraph users to check out the svn via https
without any conflicts introduced with a http externals.
