node_modules can be regenerated at build time - part 2

nodejs/makefile.am

@@ -8,6 +8,8 @@ EXTRA_DIST = servicedock.js package.json.in public routes sockets views
 
 nodejsdir = ${pkgdatadir}/nodejs
 
+all: node_modules
+
 node_modules: package.json.in
 	npm install