added a check and execution of /usr/local/etc/rc.prelocal right in the

startup phase of S55InitAddons which will be executed right before all
major homematic services are started but after the network should be up.
This should solved the need for having a user definable startup script
where users could mount external drives or executed utilities right
before the majore homematic services are started. This closes #1377.

buildroot-external/overlay/base/etc/init.d/S55InitAddons

@@ -14,7 +14,17 @@ start() {
 
   if [[ ! -e /etc/config/safemode ]]; then
 
-    # start third-party addons one after another
+    # adjust the oom score (which is inherited by run-parts)
+    # to ensure that others are killed first in case of low memory situations
+    echo 100 >/proc/$$/oom_score_adj
+
+    # call /usr/local/etc/rc.prelocal if it exists and is
+    # executable
+    if [[ -x /usr/local/etc/rc.prelocal ]]; then
+      /usr/local/etc/rc.prelocal
+    fi
+
+    # start init of third-party addons one after another
     /bin/run-parts -a init /etc/config/rc.d >/dev/null 2>&1
 
     echo "OK"