2.29.15
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  * gnutls: implement GTlsDatabase (Stef Walter, #636572)

  * gnutls: override minimum key length, to allow connecting to HTTP
    servers with very small keys (eg, on some embedded devices). (Dan
    Winship, #652284).

  * gnutls: use %COMPAT mode, which makes GNUTLS behave more like
    OpenSSL/NSS/Windows in a few ways, making it work with certain
    broken HTTP servers. (Dan Winship, part of #581342)

  * gnutls: fixed a crash when passed a NULL GError (Dan Winship)