message: Compiler warning pointed out a mistake - fix it.
diff: @@ -93,7 +93,7 @@ PlatformSP PlatformMacOSX::CreateInstance(bool force, const ArchSpec *arch) {
  #if defined(__APPLE__)
  // Only accept "unknown" for vendor if the host is Apple and it "unknown"
  // wasn't specified (it was just returned because it was NOT specified)
  - case llvm::Triple::UnknownArch:
  + case llvm::Triple::UnknownVendor:
  create = !arch->TripleVendorWasSpecified();
  break;
  #endif
  