(obsolete) os: fix missing X11/Xdefs.h include in os/osdep.h
osdep.h needs Bool type, which is defined X11/Xdefs.h. For now it works, since Xdefs usually is already included somewhere else, but that's an unreliable programming styles which quickly hits us when changing include order.
Signed-off-by: Enrico Weigelt, metux IT consult info@metux.net