CLJS-1368: cljs.analyzer tests broken, undeclared-var warning doesn't work
CLJS-1368: cljs.analyzer tests broken, undeclared-var warning doesn't work

loaded-ns? incorrectly considered ClojureScript namespaces. Only consider
JavaScript libraries that cannot curretnly be analyzed.

mstang/clojurescript,mstang/clojurescript,mstang/clojurescript