tools/net: Fix missing include

Change-Id: If8bba23866e6f129f8e9ecdb704f4b06e33a50ec
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/tools/net.cpp b/tools/net.cpp
index 8b0663e..51b9c16 100644
--- a/tools/net.cpp
+++ b/tools/net.cpp
@@ -30,6 +30,7 @@
 #include <stdplus/handle/managed.hpp>
 #include <stdplus/util/cexec.hpp>
 
+#include <array>
 #include <cstdint>
 #include <cstring>
 #include <optional>