include developer PGP keys in distribution.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@269219 13f79535-47bb-0310-9956-ffa450edef68

build.xml

@@ -343,6 +343,7 @@
         <include name="LICENSE"/>
         <include name="TODO"/>
         <include name="WHATSNEW"/>
+        <include name="KEYS"/>
       </fileset>
     </copy>
 
@@ -404,6 +405,7 @@
         <include name="LICENSE"/>
         <include name="TODO"/>
         <include name="WHATSNEW"/>
+        <include name="KEYS"/>
         <include name="build.bat"/>
         <include name="build.sh"/>
         <include name="bootstrap.bat"/>