tlsdate

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This is based on a patch I found here: https://github.com/jameshilliard/buildroot/blob/master/package/tlsdate/tlsdate-0020-openssl-ipv6.patch originally authored by Avery Pennarun ([email protected]).

Here's the original commit message:

openssl's BIO_s_connect methods support IPv4 only. Use BIO_s_fd instead to connect using a file descriptor, and supply our own pre-connected socket file descriptor. This allows us to support both IPv4 and IPv6 servers.

There may be a cleaner way to do this with the OpenSSL API more directly, but this patch seems to work fine.