JsPreBuilt: use correct sources path, error out if more than one
JsPreBuilt: use correct sources path, error out if more than one

kaufmo/koala-framework,koala-framework/koala-framework,yacon/koala-framework,nsams/koala-framework,yacon/koala-framework,koala-framework/koala-framework,nsams/koala-framework,kaufmo/koala-framework,kaufmo/koala-framework,yacon/koala-framework,nsams/koala-framework