Add file, was missing from last commit.

diff --git a/lib/arpa_inet.in.h b/lib/arpa_inet.in.h
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+++ b/lib/arpa_inet.in.h
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+/* Provide a arpa/inet header file for systems lacking it (read: MinGW)
+   Copyright (C) 2008 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#ifndef _GL_ARPA_INET_H
+#define _GL_ARPA_INET_H
+
+/* Gnulib's sys/socket.h is responsible for pulling in winsock2.h etc
+   under MinGW. */
+#include <sys/socket.h>
+
+#if @GNULIB_INET_NTOP@
+# include <inet_ntop.h>
+#elif defined GNULIB_POSIXCHECK
+# undef inet_ntop
+# define inet_ntop(af,src,dst,cnt)                                     \
+    (GL_LINK_WARNING ("inet_ntop doesn't exist on mingw - " \
+                      "use gnulib module inet_ntop for portability"), \
+     inet_ntop (af, src, dst, cnt))
+#endif
+
+#if @GNULIB_INET_PTON@
+# include <inet_pton.h>
+#elif defined GNULIB_POSIXCHECK
+# undef inet_pton
+# define inet_pton(af,src,dst)                     \
+  (GL_LINK_WARNING ("inet_pton doesn't exist on mingw - "        \
+                   "use gnulib module inet_pton for portability"),       \
+   inet_pton (af, src, dst))
+#endif
+
+#endif /* _GL_ARPA_INET_H */