ant: add apache-http to jar deps

Signed-off-by: Taylor Smock <tsmock@fb.com>

build.xml

@@ -29,6 +29,7 @@
 
   <fileset id="plugin.requires.jars" dir="${plugin.dist.dir}">
     <include name="utilsplugin2.jar"/>
+    <include name="apache-http.jar"/>
   </fileset>
 
   <target name="download-ivy">