[Xcb] XCBShapeNotifyMask missing shape.h

[Jamey Sharp]

OK, shape.xml currently has:

  <typedef oldname="CARD8" newname="SHAPE_OP" />
  <typedef oldname="CARD8" newname="SHAPE_KIND" />

but ought to also have enumerations for these types. "Bounding" is one
of two values of KIND, and "Set", "Union", etc are values of OP.

Feel free to fix these missing enumerations.

--Jamey