misc: minimize dependencies on udp.h

Type: improvement

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: Id13f33843b230a1d169560742c4f7b2dc17d8718
diff --git a/src/vnet/ipfix-export/flow_report.c b/src/vnet/ipfix-export/flow_report.c
index 56a2d16..a831c3c 100644
--- a/src/vnet/ipfix-export/flow_report.c
+++ b/src/vnet/ipfix-export/flow_report.c
@@ -17,6 +17,7 @@
  */
 #include <vnet/ipfix-export/flow_report.h>
 #include <vnet/api_errno.h>
+#include <vnet/udp/udp.h>
 
 flow_report_main_t flow_report_main;