randr: Account for panning and transforms when constraining the cursor

commit 56c90e29 [1.10.99.901]
Author: Adam Jackson <ajax@redhat.com>
Date:   Mon Nov 15 14:29:14 2010 -0500

    randr: Add RRConstrainCursorHarder

introduced a regression as it ignored the effect of panning and
transforms upon the crtc bounds. The result was that the cursor would be
constrained to the visible area even though the panning arena was much
bigger, or the cursor was constrained to a region that did not even
match the visible area when the output was transformed or reflected.

This supercedes the hack introduced by
commit 1bf81af4 [1.12.99.904]
Author: Rui Matos <tiagomatos@gmail.com>
Date:   Mon Jul 30 14:32:12 2012 -0400

    xf86RandR12: Don't call ConstrainCursorHarder() if panning is enabled
which disabled the cursor constraints if a panning mode was active, but
did not fix the regression with arbitrary output transforms.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=39949


Reviewed-by: Adam Jackson <ajax@redhat.com>
Cc: Rui Matos <tiagomatos@gmail.com>