WaE: unused variable 'aRefreshRect'

(cherry picked from commit 80b6f48d5e86c1489d1ae4a20fd5dcf5c324d33f)
Signed-off-by: Tor Lillqvist <tml@collabora.com>

Conflicts:
	vcl/aqua/source/gdi/salgdicommon.cxx

Change-Id: I6ecc96a7da2358ff91d4db46b1b07f8e56548f88
Reviewed-on: https://gerrit.libreoffice.org/8754
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>