Add wxThread::MSWGetHandle().

Under MSW a thread has both an ID, returned by wxThread::GetId(), and a
handle, which couldn't be retrieved so far. Add an accessor to do it.

Closes #16170.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76418 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/thread.cpp

@@ -1226,6 +1226,13 @@ unsigned long wxThread::GetId() const
     return (unsigned long)m_internal->GetId();
 }
 
+WXHANDLE wxThread::MSWGetHandle() const
+{
+    wxCriticalSectionLocker lock(const_cast<wxCriticalSection &>(m_critsect));
+
+    return m_internal->GetHandle();
+}
+
 bool wxThread::IsRunning() const
 {
     wxCriticalSectionLocker lock(const_cast<wxCriticalSection &>(m_critsect));