Add missing #includes

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

src/network/network.cc

@@ -22,6 +22,7 @@
 #include <arpa/inet.h>
 #include <assert.h>
 #include <endian.h>
+#include <errno.h>
 
 #include "dos_assert.h"
 #include "network.h"

src/network/transportsender.cc

@@ -18,6 +18,7 @@
 
 #include <algorithm>
 #include <list>
+#include <stdio.h>
 
 #include "transportsender.h"
 #include "transportfragment.h"