bug#25061: consider adding %COMPAT to default gnutls priority string

[Kaushal Modi <kaushal.modi@gmail.com>]

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Hello,

I install packages from Org Elpa and Melpa on the fly on Travis CI. Travis
CI is a continuous integration service used by many GitHub projects and it
uses an image (trusty) that's based off Ubuntu 14.04.

They made an update to their Ubuntu 14.04 image last week, and after that
these errors started showing up when emacs tried to retrieve package
archives:

Full log:https://travis-ci.org/jwiegley/use-package/jobs/317613388

Relevant excerpt:
=====
Contacting host: elpa.gnu.org:443

gnutls.el: (err=[-50] The request is invalid.) boot: (:priority
NORMAL:%DUMBFW :hostname elpa.gnu.org :loglevel 0 :min-prime-bits 256
:trustfiles (/etc/ssl/certs/ca-certificates.crt) :crlfiles nil :keylist nil
:verify-flags nil :verify-error nil :callbacks nil)

Failed to download ‘gnu’ archive.

Contacting host: melpa.org:443

gnutls.el: (err=[-50] The request is invalid.) boot: (:priority
NORMAL:%DUMBFW :hostname melpa.org :loglevel 0 :min-prime-bits 256
:trustfiles (/etc/ssl/certs/ca-certificates.crt) :crlfiles nil :keylist nil
:verify-flags nil :verify-error nil :callbacks nil)

Failed to download ‘melpa’ archive.
Package refresh done.
=====

I got the packages from Melpa to install fine only after I switch from
https to http.

Is this gnutls.el error related to this bug? This was on the latest
emacs-26 build as of yesterday.
-- 

Kaushal Modi

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