Add missing variable definitions to java VPP API

Change-Id: I121b26f4d566417e7cb5ee1a021896dd7dc5599e
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>

vpp-api/java/jvpp-registry/jvpp_registry.c

@@ -19,6 +19,7 @@
 #include <vpp-api/vpe.api.h>
 #undef vl_api_version
 
+
 #include <jni.h>
 #include <jvpp-common/jvpp_common.h>
 #include "io_fd_vpp_jvpp_VppJNIConnection.h"
@@ -39,6 +40,9 @@
 #include <vpp-api/vpe_all_api_h.h>
 #undef vl_printfun
 
+vlib_main_t vlib_global_main;
+vlib_main_t **vlib_mains;
+
 /*
  * The Java runtime isn't compile w/ -fstack-protector,
  * so we have to supply missing external references for the