fix ant build script

Signed-off-by: Umair Khan <[email protected]>

Author: omerjerk

build.xml

@@ -2,6 +2,7 @@
 <project name="Video Library for Processing Android" default="build">
 
   <property name="processing.dir" value="../../processing" />
+  <property environment="env"/>
 
   <target name="clean" description="Clean the build directories">
     <delete dir="bin" />