openvpn: add OpenVPN option server-poll-timeout

See https://www.mankier.com/8/openvpn#--server-poll-timeout

Signed-off-by: Alexander Egorenkov <egorenar-dev@posteo.net>

net/openvpn/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=openvpn
 
 PKG_VERSION:=2.5.1
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_URL:=\
 	https://build.openvpn.net/downloads/releases/ \

net/openvpn/files/openvpn.options

@@ -107,6 +107,7 @@ secret
 server
 server_bridge
 server_ipv6
+server_poll_timeout
 setenv
 shaper
 sndbuf