bug#19346: 25.0.50; url-http-parse-headers: Symbol's function definition is void: gnutls-available-p

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Ted Zlatanov <tzz@lifelogs.com>,  hi@yagnesh.org,  19346@debbugs.gnu.org, 
>  larsi@gnus.org
> Date: Thu, 11 Dec 2014 19:02:04 -0500
> 
> AFAICT for dynamically-loaded modules we won't need any such
> foo-available-p function, instead we'll use (require '<modulename> nil t).

You just described one possible implementation of foo-available-p.

And AFAIU we still need to implement something in 'require' for this,
because currently it cannot load modules, only Lisp files.