8193056: Title from build failure with Xcode 9.1
Summary: Included missing header explicitly.
Reviewed-by: coleenp, vlivanov
Welcome to OpenJDK!
===================
For information about building OpenJDK, including how to fully retrieve all
source code, please see either of these:
* doc/building.html (html version)
* doc/building.md (markdown version)
See http://openjdk.java.net/ for more information about OpenJDK.