[PATCH] Add source id to RawEvents in XI 2.1

[Peter Hutterer]

Another addition for raw events in XI 2.1. Though the libXi interface has a
sourceid field, that field is always 0 because the protocol is missing the
bit to send it down the wire.

So in 2.1, replace one of the padding fields in the event struct with the
source device ID.

Cheers,
  Peter