fix warning: "HAVE_NETINET_IN_SYSTM_H"/"HAVE_NETINET_IP_H" is not defined

Part of #935.

Change-Id: Ibcc4ad4370a6f99b030ca2c44f151c4550695957
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
(cherry picked from commit 6c10c3e6e65ffca32d97b3f2ef4db839c049a85c)
Signed-off-by: Bruce A. Mah <bmah@es.net>

src/dscp.c

@@ -42,10 +42,10 @@ const char * iptos2str(int iptos);
  * Definitions for IP type of service (ip_tos)
  */
 
-#if HAVE_NETINET_IN_SYSTM_H
+#ifdef HAVE_NETINET_IN_SYSTM_H
 #include <netinet/in_systm.h>
 #endif
-#if HAVE_NETINET_IP_H
+#ifdef HAVE_NETINET_IP_H
 #include <netinet/ip.h>
 #endif