Use --no-bin-links to turn off symlinking for npm install

There are filesystems without symlinks (Vagrant on Windows Host).
See the error at #2971

Makefile

@@ -63,7 +63,7 @@ test-cov: env
 tests: test
 
 node_modules: package.json
-	npm install
+	npm install --no-bin-links
 	@if [ -d node_modules ]; then touch node_modules; fi
 
 jstest: node_modules