Fix warnings in js-ir/runtime/jsIntrinsics.kt

Suppress "UNUSED_PARAMETER" to fix compilation warnings. Also suppress
"unused" to make the file less yellow in the IDE.

Also enable `-Werror`, unless Gradle property
`kotlin.build.disable.werror` is set to true.

libraries/stdlib/js-ir/runtime/jsIntrinsics.kt

@@ -3,7 +3,7 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
-@file:Suppress("NON_MEMBER_FUNCTION_NO_BODY")
+@file:Suppress("NON_MEMBER_FUNCTION_NO_BODY", "UNUSED_PARAMETER", "unused")
 
 package kotlin.js