[request] Consider building emacs27 and emacs27-nox11 with gnutls

[mmjjnn]

Currently Emacs is built by default without gnutls. It is available as a package option for emacs27, but not for emacs27-nox11. However since 27.1 the previous built-in ways of getting TLS support in Emacs have been removed, so gnutls is almost necessary now. Various common things, like installing MELPA packages or browsing/downloading from the web, don't work out of the box anymore without a recompile.

Here's the NEWS entry from the 27.1 release:

The tls.el and starttls.el libraries are now marked obsolete. Use of built-in libgnutls based functionality (described in the Emacs GnuTLS manual) is recommended instead.