Support SOCKS5 for assuan_sock_connect.

* src/assuan-socket.c: Include netinet/in.h and arpa/inet.h.
(SOCKS_PORT, TOR_PORT): New constants.
(tor_mode): New variable.
(_assuan_sock_set_flag): Add flags "tor-mode" and "socks".
(_assuan_sock_get_flag): Ditto.
(do_readn, do_writen): Always build.
(socks5_connect): New.
(use_socks): New.
(_assuan_sock_connect): Divert to socks5_connect if requested.

* tests/socks5.c: New.
* configure.ac (AH_TOP): Define GPGRT_ENABLE_ES_MACROS.
(AC_CHECK_FUNC): Check for getaddrinfo.
* tests/Makefile.am (testtools): New. Add socks5.
(AM_LDFLAGS): Add -no-install for easier debugging.
--

A future extension might be a new assuan_sock_direct_connect call
takes the hostname as a string and returns a new socket.  This allows
the proxy to do the resolving.  However, in the long term these socket
wrapper should be moved to libgpgrt (aka libgpg-error).

Signed-off-by: Werner Koch <wk@gnupg.org>

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