compile_pkgs: fix typo causing build to be run in single thread

This simple typo caused forice-make to run only in fallback mode. That
is always building in single thread with verbose output.

compile_pkgs

@@ -125,7 +125,7 @@ _openwrt_make() {
 	if [ -z "$FORCE" ]; then
 		mk=("make" -j "$BUILD_JOBS")
 	else
-		mk=("$src_dir/helpers/force-make" "-j" "$BULD_JOBS" "-c" "$FORCE" "-f" "V=s" "--")
+		mk=("$src_dir/helpers/force-make" "-j" "$BUILD_JOBS" "-c" "$FORCE" "-f" "V=s" "--")
 	fi
 
 	"${mk[@]}" ${debug:+-d} \