configuregateway: Only match "function" in subshell

When running OpenWrt master, "type <functionname>" only returns
"<functionname> is a function". Thus, to make the implementation
future-proof and since it is also working with the current state,
change the grep in execute_subshell to match "function".

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Reviewed-by: Fabian Bläse <fabian@blaese.de>
Reviewed-by: Robert Langhammer <rlanghammer@web.de>

src/packages/fff/fff-gateway/Makefile

@@ -1,8 +1,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=fff-gateway
-PKG_VERSION:=1
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_BUILD_DIR:=$(BUILD_DIR)/fff-gateway
 

src/packages/fff/fff-gateway/files/usr/sbin/configuregateway

@@ -24,7 +24,7 @@ execute_subshell() {
 			unset -f "$1"
 			. "$script"
 
-			if type "$1" | grep -q "shell function"; then
+			if type "$1" | grep -q "function" ; then
 				"$1"
 			fi
 		)