autoconf: NO_IPV6
autoconf: NO_IPV6

We would need both "struct addrinfo" and getaddrinfo()
available.  Check them and set NO_IPV6 otherwise.

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git