source from xorg-server-1.15.1-2, see
http://x.cygwin.com/docs/cg/prog-obtaining-source.html
Merge original source from xorg-server-1.15.1-2

Conflicts:
	cygwin/dix/dispatch.c
	cygwin/hw/xwin/winkeybd.c
	cygwin/hw/xwin/winmultiwindowwindow.c
	cygwin/hw/xwin/winmultiwindowwndproc.c
	cygwin/hw/xwin/winwakeup.c
successfully build merged xorg-server-1.15.1-2