Fixes a regression introduced in
c45477d2a1.
Reported by Christopher Baines <mail@cbaines.net>.
* guix/scripts/pack.scm (not-config?, guile-sqlite3&co): New variables.
(self-contained-tarball)[not-config?]: Remove.
[build]: Use GUILE-SQLITE3&CO for 'with-extensions'.
(squashfs-image)[libgcrypt]: New variable.
[build]: Use 'source-module-closure', 'make-config.scm', and
'with-extensions'.
(docker-image)[not-config?]: Remove.