Add missing headers to get htons() prototype.

Author: millert

lib/util/regress/uuid/uuid_test.c

@@ -27,6 +27,10 @@
 #include <string.h>
 #include <unistd.h>
 
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
 #define SUDO_ERROR_WRAP 0
 
 #include <sudo_compat.h>