winex11.drv: Moved initialization of screen_width/height to xinerama_init to do it inside the x11 lock.

winex11.drv: Don't create a win_data structure for the desktop window, except in the process that owns it.

Handle desktop size changes by sending a message to the desktop owner.

rpcrt4: Only initialise the context handle to NULL in NdrContextHandleUnmarshall if it is an out-only or return one.

Fix the indentation and add tracing of the context handle flags.

Don't execute Run entries in that case.

In this case just draw the frame without starting the timer thread of 
setting a timer and without sending any notifications.