syslog-ng: provide correct PID directory location to restart/stop syslog-ng daemon

If "--with-pidfile-dir" configure option is not specified, then the syslog-ng
configure script assigns PID directory to /var/lib/syslog-ng; which is
where the PID file of syslog-ng process is created. But the syslog-ng
initscript (/etc/init.d/syslog-ng) uses /var/lib/syslog-ng/
as PID directory, this results in not stopping/restarting syslog-ng daemons
when it was requested to do so.

For example:
-- snip --
root@qemux86:~# /etc/init.d/syslog status
/usr/sbin/syslog-ng (pid 345 344) is running...
root@qemux86:~# /etc/init.d/syslog stop
Stopping syslog-ng:.
root@qemux86:~# /etc/init.d/syslog status
/usr/sbin/syslog-ng (pid 345 344) is running...
root@qemux86:~#
-- snip --

Hence set --with-pidfile-dir to "/var/run/syslog-ng", so that syslog-ng daemon
can be stopped/restarted via initscript.

Signed-off-by: Jagadeesh Krishnanjanappa <jkrishnanjanappa@mvista.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-support/syslog-ng/syslog-ng.inc

@@ -36,6 +36,7 @@ EXTRA_OECONF = " \
     --with-librabbitmq-client=no \
     --disable-python \
     --disable-java --disable-java-modules \
+    --with-pidfile-dir=${localstatedir}/run/${BPN} \
     ${CONFIG_TLS} \
 "