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At least, fedora 20 doesn't enable it.

This was never used. The web interface requires a password instead.

val is always zero in the removed code; the verification status is what
actually matters.

http://msdn.microsoft.com/en-us/library/b0084kay(v=vs.80).aspx only
mentions the _ prefixed variable.

gcc will always define the _ prefixed variable, like Visual Studio.
The prefixless one is defined in some language standards, e.g. gnu99
but not c99.

With older versions, client support pretty much does not work.

Based on the gnutls_handshake manual the function must be called again
until it returns 0 (or a fatal error).
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

If a certificate does not validate, the user will be given the option
to accept it manually. GnuTLS will then store the certificate in its
known hosts database.

This will be used for fine-grained GnuTLS stored public keys,
i.e. SSH-like authentication on first use.