PIG-2362: Rework Ant build.xml to use macrodef instead of antcall (azaroth via cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1428768 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' of git://git.apache.org/pig into trunk
Merge branch 'trunk' of github.com:jcoveney/pig into trunk