opkg: Fix patch glitches

The original patch contained some text which shouldn't have been there
and used brackets in configure which isn't a great idea. Tweak the patch
to resolve this.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 63cbf187)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>