(svn r12999) -Fix [FS#1995]: when a Window got deleted on a double click event, we should not send a click event to the now non-existant Window as that causes segfaults.

Makefile*
bin/*
!bin/data/chars.grf
!bin/data/openttdd.grf
!bin/data/openttdw.grf
!bin/data/opntitle.grf
!bin/scenario/README
!bin/scripts*
config.*
objs/*
src/rev.cpp