opkg-utils: use D instead of OPKG_OFFLINE_ROOT in postrm

While both result in the same in this case, postrm
should really be referring to $D as we do everywhere
else.

(From OE-Core rev: 7e459843e0371953d3d9d3ad05b019947ed7ca04)

Signed-off-by: André Draszik <adraszik@tycoint.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/opkg-utils/opkg-utils_git.bb

@@ -46,8 +46,8 @@ RREPLACES_update-alternatives-opkg = "update-alternatives-cworth"
 RCONFLICTS_update-alternatives-opkg = "update-alternatives-cworth"
 
 pkg_postrm_update-alternatives-opkg() {
-	rm -rf $OPKG_OFFLINE_ROOT${nonarch_libdir}/opkg/alternatives
-	rmdir $OPKG_OFFLINE_ROOT${nonarch_libdir}/opkg || true
+	rm -rf $D${nonarch_libdir}/opkg/alternatives
+	rmdir $D${nonarch_libdir}/opkg || true
 }
 
 BBCLASSEXTEND = "native nativesdk"