[PATCH] Update gnurl.

[ng0]

I just released the new gnurl version to sync up with curl.

As was pointed out in irc, there's a design decision in curl which could be 
fixed,
a hardcoded ca-path. Can someone who knows a bit about this open a bug at guix 
addressing this?
Just from reading and searching I do not know which part could be fixed so that 
it fits your
needs. I do not require exact code locations, just what am I looking for? 
something /etc/some/path/ and /some/other/alternative/ else; nothing .. grep 
for /etc/, ca-certificate, certificate and others do not return many results so 
it should be easy if it is included in those results.