openvpn: add "extra-certs" option

This option is used to specify a file containing PEM certs, to complete the
local certificate chain. Which is quite usefull for "split-CA" setups.

Signed-off-by: Sven Roederer <devel-sven@geroedel.de>
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

package/network/services/openvpn/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=openvpn
 
 PKG_VERSION:=2.4.3
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_URL:=\
 	https://build.openvpn.net/downloads/releases/ \

package/network/services/openvpn/files/openvpn.options

@@ -30,6 +30,7 @@ ecdh_curve
 echo
 engine
 explicit_exit_notify
+extra_certs
 fragment
 group
 hand_window