Remove undesired dh_shlibdeps override

Refs T770. Similar to D1434.

Reviewed-by: Philip Withnall <philip.withnall@collabora.co.uk>
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D1642

debian/rules

@@ -18,6 +18,3 @@ override_dh_install:
 
 override_dh_strip:
 	dh_strip --dbg-package=prestwood-dbg
-
-override_dh_shlibdeps:
-	dh_shlibdeps -a -- --ignore-missing-info