Merge changes Idc985c52,Ibbbde323,I51417cf6,I9886498d,I195d99c9

* changes:
  Move LLNDK and NDK versionSelectorMutator special cases into versionedInterface
  use version mutator for CRT
  Use version mutator for NDK
  Reuse more of apex stubs implementation for llndk stubs
  Use libraryInterface instead of concrete type asserts for stubs