dirmngr: Fix for Windows.
* dirmngr/http.c (EHOSTUNREACH, EAFNOSUPPORT): Define when not available. [HTTP_USE_GNUTLS] (my_gnutls_read): Use recv for Windows. [HTTP_USE_GNUTLS] (my_gnutls_write): Use send for Windows.
- Reported-by: Eli Zaretskii
- GnuPG-bug-id: T5899
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>