Add "vpp-api-install" to plugins_configure_depend in build-data/packages/plugins.mk

As per Ole Troan mail https://lists.fd.io/pipermail/vpp-dev/2016-November/003296.html
(message id <D3FB63FB-D144-4CBA-B4AB-CDE46B83D838@cisco.com>):

Change-Id: I7f9d13c079505257bc8b37eecd8318cd360a56c3
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
diff --git a/build-data/packages/plugins.mk b/build-data/packages/plugins.mk
index 5304019..44a8e2b 100644
--- a/build-data/packages/plugins.mk
+++ b/build-data/packages/plugins.mk
@@ -3,7 +3,8 @@
     vlib-api-install 				\
     vpp-api-test-install 			\
     vnet-install                                \
-    vlib-install 
+    vlib-install 				\
+    vpp-api-install
 
 plugins_CPPFLAGS = $(call installed_includes_fn, 	\
     vppinfra 					\