[PATCH xim] Send screen number

[Takao Fujiwara]

Hi,
I'm a maintainer of IBus which is an input method framework.
Xorg ZaphodHeads environment provides the multiple screens.
I think currently XIM protocol does not send the $DISPLAY information in the client applications to the XIM server and IBus cannot know the screen  
number of the client applications.

The following patch can send the client DISPLAY information to the XIM server:

https://github.com/fujiwarat/libX11/commits/xim-screen-number

Could you evaluate the patch?
Fujiwara