hg: jdk7/build: 6781784: Fix ant link in build readme

[kelly . ohair]

Changeset: 60aab86966e9
Author:    ohair
Date:      2008-12-05 17:18 -0800
URL:       http://hg.openjdk.java.net/jdk7/build/rev/60aab86966e9

6781784: Fix ant link in build readme
Reviewed-by: michaelm

! README-builds.html