fix endian errors in arpa/nameser.h due to failure to include endian.h

include/arpa/nameser.h

@@ -7,6 +7,7 @@ extern "C" {
 
 #include <stddef.h>
 #include <stdint.h>
+#include <endian.h>
 
 #define __NAMESER	19991006
 #define NS_PACKETSZ	512