net.c: recognize MSG_WAITFORONE

* net.c (msg_flags): Add MSG_WAITFORONE.
diff --git a/net.c b/net.c
index e7c7b2b..8703b8b 100644
--- a/net.c
+++ b/net.c
@@ -587,6 +587,9 @@
 #ifdef MSG_MORE
 	{ MSG_MORE,		"MSG_MORE"		},
 #endif
+#ifdef MSG_WAITFORONE
+	{ MSG_WAITFORONE,	"MSG_WAITFORONE"	},
+#endif
 #ifdef MSG_CMSG_CLOEXEC
 	{ MSG_CMSG_CLOEXEC,	"MSG_CMSG_CLOEXEC"	},
 #endif