Fix "Old Style VLA" build warnings

Change-Id: I8d42f6ed58ec34298d41edcb3d783e7e9ded3eec
Signed-off-by: Juraj Sloboda <jsloboda@cisco.com>
diff --git a/src/vlibmemory/memclnt.api b/src/vlibmemory/memclnt.api
index 923df69..cc37c7c 100644
--- a/src/vlibmemory/memclnt.api
+++ b/src/vlibmemory/memclnt.api
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-option version = "1.0.0";
+option version = "2.0.0";
 
 /*
  * Define services not following the normal convetions here
@@ -91,7 +91,8 @@
     u8 multicast;
     u8 need_barrier_sync;
     u8 send_reply;
-    u8 data[0];
+    u32 data_len;
+    u8 data[data_len];
 };
 
 /*