This reinstates c625e5b64d, which was
reverted due to a circular dependency:
https://issues.guix.gnu.org/63331
This is a followup to 305794762c, which
removed Guile bindings from 'gnutls'.
* guix/android-repo-download.scm (android-repo-fetch): Refer to
'guile-gnutls instead of 'gnutls.
* guix/cvs-download.scm (cvs-fetch): Likewise.
* guix/git-download.scm (git-fetch): Likewise.
* guix/hg-download.scm (hg-fetch): Likewise.