strongswan: strongswan-ipsec (5.9.14-r4) post-install script will not work after apk transition

[vincejv]

Maintainer: @pprindeville @Thermi
Environment: x86_64 SNAPSHOT r28085-6720c4ccba

Description: after opkg to apk transition, this post install script will no longer work

( 3/95) Installing strongswan-ipsec (5.9.14-r4)
Executing strongswan-ipsec-5.9.14-r4.post-install
/dev/fd/8: line 12: opkg: not found

Offending code:

packages/net/strongswan/Makefile

Lines 557 to 559 in bea58ee

	opkg list-changed-conffiles | grep -qx /etc/ipsec.conf || {
	rm -f /etc/ipsec.conf-opkg
	}