Add JNI bridge for setup_payload (#1454)

Adding the JNI bridging C++ and Java code to setup_payload package for 
use in Android apps.
diff --git a/configure.ac b/configure.ac
index ea193f5..9a82daa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2163,6 +2163,7 @@
 src/system/Makefile
 src/system/tests/Makefile
 src/setup_payload/Makefile
+src/setup_payload/java/Makefile
 src/setup_payload/tests/Makefile
 src/inet/Makefile
 src/inet/tests/Makefile