dsme & mce: set DSME_SOCKFILE explicitely to avoid a SIGSEGV on libdsme's dsmesock_default_location

recipes-nemomobile/dsme/dsme/dsme.service

@@ -11,6 +11,7 @@ Type=notify
 # If it doesn't exist, we default to USER
 # This works because EnvironmentFile overrides Environment
 Environment=BOOTSTATE=USER
+Environment=DSME_SOCKFILE=/run/dsme.socket
 EnvironmentFile=-/run/systemd/boot-status/bootstate
 EnvironmentFile=-/var/lib/environment/dsme/*.conf
 ExecStart=/usr/sbin/dsme -v 4 -p /usr/lib/dsme/startup.so --systemd

recipes-nemomobile/mce/mce/mce.service

@@ -8,6 +8,7 @@ Conflicts=shutdown.target
 
 [Service]
 Type=notify
+Environment=DSME_SOCKFILE=/run/dsme.socket
 ExecStart=/usr/sbin/mce --systemd
 TimeoutSec=2
 Restart=always