7016976: Documentation for required ant version on JDK7 builds on Solaris 10 and Solaris 11

Reviewed-by: rinaldo

README-builds.html

@@ -921,7 +921,7 @@
             <!-- ------------------------------------------------------ -->
             <h4><a name="ant">Ant</a></h4>
             <blockquote>
-                All OpenJDK builds require access to least Ant 1.6.5.
+                All OpenJDK builds require access to least Ant 1.7.1.
                 The Ant tool is available from the 
                 <a href="http://ant.apache.org" target="_blank">
                     Ant download site</a>.