Inspired on one of the patches on debian ant

Minimum java version 1.8+ is 1.4.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@922191 13f79535-47bb-0310-9956-ffa450edef68

build.xml

@@ -102,8 +102,8 @@
   <property name="chmod.maxparallel" value="250"/>
   <property name="deprecation" value="false"/>
   <property name="optimize" value="true"/>
-  <property name="javac.target" value="1.2"/>
-  <property name="javac.source" value="1.2"/>
+  <property name="javac.target" value="1.4"/>
+  <property name="javac.source" value="1.4"/>
   <property name="junit.fork" value="false"/>
   <property name="junit.filtertrace" value="off"/>
   <property name="junit.summary" value="no"/>