The defaultPointerControl holds compile-time defaults for pointer
acceleration. If an Xnest instance is started, it resets the hosts pointer
accel values to these built-in defaults instead of using the host values.
This patch queries the host for the values before initializing the device,
thus leaving the host values untouched.
X.Org Bug 10013 <http://bugs.freedesktop.org/show_bug.cgi?id=10013>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>