Create Java6 bytecode for transdroid.jar

Android will only be able to create Dalvik bytecode if the input Java
bytecode is in Java6 format. Otherwise we get a bunch of
NoClassDefFoundError Exceptions along with "Could not find class X",
"Unable to resolve static method Y" and such errors for code in
transdroid.jar.

lib/build.xml

@@ -19,6 +19,7 @@
 	srcdir="src/"
 	destdir="build/"
 	bootclasspath="${sdk-location}/platforms/${android.version}/android.jar"
+	target="6"
 	/>
     <jar
 	destfile="../core/libs/transdroid.jar"