_gnutls_hostname_compare: toupper vs. c_toupper

[Kalle Olavi Niemitalo]

In GnuTLS 2.8.6 and 2.10.5, _gnutls_hostname_compare uses toupper
on the characters of the hostname:

  /* find the first different character */
  for (; *certname && *hostname && toupper (*certname) == toupper (*hostname);
       certname++, hostname++, certnamesize--)
    ;

I suspect this should be c_toupper instead, so that 'i' matches
'I' in hostnames even in a Turkish (or is that Turkic?) locale.
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