Historically, if no input device was referenced in the ServerLayout,
the server would pick the first "mouse" device found in the xorg.conf.
This patch gives evdev, synaptics, vmmouse and void the same status. If
there is a section in the config file using this driver - use it as the core
pointer.
Device selection is in driver-order, not in config-order. If a "mouse"
device is listed after a "synaptics" device, the "mouse" device gets
preference. This replicates the original behaviour.
This code only takes effect if AllowEmptyInput is off and there is no core
pointer in the server layout.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
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