Add missing includes to eliminate -Wmissing-prototypes warnings

lib/libc/net/ntoh.c

@@ -28,6 +28,8 @@
 __FBSDID("$FreeBSD$");
 
 #include <sys/endian.h>
+#define _BYTEORDER_FUNC_DEFINED
+#include <arpa/inet.h>
 
 uint32_t
 htonl(uint32_t hl)

lib/libc/net/sockatmark.c

@@ -26,6 +26,7 @@
  */
 #include "namespace.h"
 #include <sys/ioctl.h>
+#include <sys/socket.h>
 #include "un-namespace.h"
 
 int sockatmark(int s)