package/dhcpcd: use /run for PIDFile

Fixes:

PIDFile= references a path below legacy directory /var/run/, updating
/var/run/dhcpcd.pid → /run/dhcpcd.pid; please update the unit file
accordingly.

Signed-off-by: Michael Nosthoff <buildroot@heine.tech>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/dhcpcd/dhcpcd.service

@@ -5,7 +5,7 @@ After=network.target
 [Service]
 Type=forking
 EnvironmentFile=-/etc/default/dhcpcd
-PIDFile=/var/run/dhcpcd.pid
+PIDFile=/run/dhcpcd.pid
 ExecStart=/sbin/dhcpcd $DAEMON_ARGS
 Restart=always