Don't detect library kind for pure JVM projects

Also require .kjsm to detect JS libraries; don't detect jars containing
only .js files as JS libraries

 #KT-19717 Fixed

idea/idea-analysis/src/org/jetbrains/kotlin/idea/framework/LibraryKinds.kt

@@ -84,7 +84,7 @@ private fun detectLibraryKindFromJarContents(jarRoot: VirtualFile): PersistentLi
                 when (file.extension) {
                     "class" -> false
 
-                    "js", "kjsm" -> {
+                    "kjsm" -> {
                         result = JSLibraryKind
                         false
                     }

idea/idea-gradle/src/org/jetbrains/kotlin/idea/configuration/KotlinGradleSourceSetDataService.kt

@@ -109,7 +109,7 @@ class KotlinGradleLibraryDataService : AbstractProjectDataService<LibraryData, V
         if (toImport.isEmpty()) return
         val projectDataNode = toImport.first().parent!! as DataNode<ProjectData>
         val moduleDataNodes = projectDataNode.children.filter { it.data is ModuleData } as List<DataNode<ModuleData>>
-        if (moduleDataNodes.any { detectPlatformByPlugin(it) != null}) {
+        if (moduleDataNodes.any { detectPlatformByPlugin(it)?.takeIf { it !is TargetPlatformKind.Jvm } != null }) {
             for (libraryDataNode in toImport) {
                 val ideLibrary = modelsProvider.findIdeLibrary(libraryDataNode.data) ?: continue