base-files: remove ${sysconfdir}/tmpfiles.d/var-run.conf

Fix conflict with systemd's version of the same file causing errors at
do_rootfs like:

|  * check_data_file_clashes: Package systemd wants to install file /home/andreas/tmp/oe-core-eglibc/work/overo-angstrom-linux-gnueabi/xfce4-full-image/1.0-r0/rootfs/etc/tmpfiles.d/var-run.conf
|       But that file is already provided by package  * base-files

recipes-core/base-files/base-files_3.0.14.bbappend

@@ -1,8 +1,6 @@
 FILESEXTRAPATHS := "${THISDIR}/${PN}"
-
-PRINC = "14"
 
-SRC_URI_append = " file://var-run.conf"
+PRINC = "15"
 
 # Original: volatiles = "cache run log lock tmp"
 # We don't any of those in volatiles, so:
@@ -34,8 +32,3 @@ do_install_angstromissue () {
         echo >> ${D}${sysconfdir}/issue
     fi
 }
-
-do_install_append() {
-	install -d ${D}${sysconfdir}/tmpfiles.d
-	install -m 0644 ${WORKDIR}/var-run.conf ${D}${sysconfdir}/tmpfiles.d/
-}