JDK 8 RFR for JDK-8022658: Revisit FunctionalInterface on some core libs types

[mark.reinhold at oracle.com]

2013/10/21 4:53 -0700, joe.darcy at oracle.com:
> I was on the fence for Iterable too. Other opinions?

When in doubt, leave it out.  Omitting this annotation won't
prevent people from using lambda expressions to implement the
Iterable interface, and we can always add it back later as
experience warrants.

- Mark