Re-add olsr2 patch

patches/packages/routing/0004-oonf-olsrd2-add-support-to-check-if-service-is-running.patch

@@ -0,0 +1,21 @@
+From: Maciej Krüger <mkg20001@gmail.com>
+Date: Sun, 10 Apr 2022 01:58:41 +0200
+Subject: oonf-olsrd2: add support to check if service is running
+
+diff --git a/oonf-olsrd2/files/olsrd2.init b/oonf-olsrd2/files/olsrd2.init
+index 04b30ffa4a7a4d65e2fb9944e4570273a9418f2e..f516b1b17e32b7eba7c4d485d72a123c87fb52f6 100755
+--- a/oonf-olsrd2/files/olsrd2.init
++++ b/oonf-olsrd2/files/olsrd2.init
+@@ -5,4 +5,12 @@ DAEMON='olsrd2'
+ 
+ [ -n "$IPKG_INSTROOT" ] || {
+         . /lib/functions/oonf_init.sh
++
++        running() {
++          test -e "/tmp/run/olsrd2.pid" && test -e "/proc/$(cat "/tmp/run/olsrd2.pid")" && return 0
++          return 1
++        }
++
++        extra_command "running" "Check if service is running"
+ }
++