* src/events.c, src/client.c: Fix ICCCM synthetic unmap notify

	  handling causing a race condition with amule when started hidden 
	  to system tray (Bug #4928). Note: This is still unclear to me
	  what is correct behaviour here, the problem reported in bug
	  #4928 happens with some other window managers too (e.g. kwin from
	  kde 4.2, fluxbox) but not with others (openbox, metacity, icewm).

(Old svn revision: 29493)