x11drv more verbose error message

Wed Jan 28 20:00:11 CST 2004

A case of each of these issues was seen on #winehq, add a more verbose error 
message.

* dlls/x11drv/x11drv_main.c
Chris Morgan <cmorgan at alum.wpi.edu>
If unable to open an X11 display mention that X needs to be running and that 
$DISPLAY must be set correctly.

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