Build openwrt packages with correct rundir

It turns out that the openwrt systems that I have been using to test my
OpenWRT package builds (All Turris Omnia systems) appears to have had a
vendor patch applied to create a symlink from "/run" to "/var/run".  On
a vanilla OpenWRT system, there is no "/run".  Use the new configure
option to set the correct run dir location.

(Also deal with the OpenWRT auto conf tools being too old to include the
runstatedir option)

(See PR n42n#48, n42n#49)

configure.ac

@@ -43,6 +43,12 @@ case "$host_os" in
         ;;
 esac
 
+AC_ARG_WITH([rundir],
+    AS_HELP_STRING([--with-rundir=DIR], [location of the system /run dir]),
+    [rundir=$withval],
+    [rundir="/run"]
+)
+
 AC_ARG_WITH([systemddir],
     AS_HELP_STRING([--with-systemddir=DIR], [Where to install systemd units]),
     [systemddir=$withval],
@@ -120,10 +126,6 @@ AS_IF([test "x$prefix" = "xNONE" ],
     prefix=/usr/local
 )
 
-AS_IF([test "x$runstatedir" = 'x${localstatedir}/run' ],
-    runstatedir=/run
-)
-
 # The systemd unit dir should be in a sane location (based on the prefix) but
 # that is not always a dir underneath the prefix.  Apply another hack
 AS_IF([test "x$systemddir" = "x" ],
@@ -138,7 +140,7 @@ AS_IF([test "x$systemddir" = "x" ],
 CONFIG_DOCDIR=$(eval echo $(eval echo $docdir))
 CONFIG_MANDIR=$(eval echo $(eval echo $mandir))
 CONFIG_PREFIX=$prefix
-CONFIG_RUNDIR=$runstatedir
+CONFIG_RUNDIR=$rundir
 CONFIG_SYSTEMDDIR=$systemddir
 
 configure_command=$0$ac_configure_args_raw

packages/openwrt/Makefile

@@ -57,7 +57,7 @@ endef
 define Build/Configure
 	( cd $(PKG_BUILD_DIR); \
 	./autogen.sh; \
-	LDFLAGS=--static ./configure )
+	LDFLAGS=--static ./configure --with-rundir=/var/run )
 endef
 
 define Package/n3n-edge/conffiles