langtools ant 1.8.0 fix

[Joe Darcy]

Kelly O'Hair wrote:
>
> Should I apply this change to openjdk6?
>
> 6938326: Use of "ant -diagnostics" a problem with ant 1.8.0, exit code 
> 1 now
> http://hg.openjdk.java.net/jdk7/tl/langtools/rev/de6375751eb7
>
> -kto

Is there no good version of ant?  Others might ask the same of the JDK ;-)

The change seems okay to me, but I'd like to hear Andrew's opinion 
before it goes back.

-Joe