Remove vppversion subtree, move elftool to vppinfra

Change-Id: I26b29a0f53f81a28cbf264f5299f9a3978735574
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/build-data/platforms/vpp.mk b/build-data/platforms/vpp.mk
index 1975a86..a09b030 100644
--- a/build-data/platforms/vpp.mk
+++ b/build-data/platforms/vpp.mk
@@ -13,7 +13,7 @@
 
 # vector packet processor
 vpp_arch = native
-vpp_native_tools = vppapigen vppversion
+vpp_native_tools = vppapigen
 
 vpp_root_packages = vpp vlib vlib-api vnet svm dpdk vpp-api-test \
 	vpp-japi