[Xcb] Set/GetScreenSaver

[Vincent Torri]

Hey,

again, a remark :

the timeout member in the XCBGetScreenSaverRep structure is a CARD16, but 
the function XCBSetScreenSaver requires an INT16.

Is it normal ?

same for interval member.

the members prefer_blanking and allow_exposures have the same types than 
in the function, but not the same name (BYTE and CARD8)

Vincent