Let enhmetafiles reuse gdi handles. This works by a dc 'registering'

Let enhmetafiles reuse gdi handles.  This works by a dc 'registering'
with an object that it wants to know when the object is deleted. Until
the dc gets delete notification it's free to assume that it doesn't
need to write the create record for that object again.  Upon receiving
the delete notification it writes the DeleteObject record. Windows
seems to do it this way too.