self: Use default config variable values for derivations.

The value of %localstatedir, %storedir, and %sysconfdir is known to have
no impact on the compilation of the Guix modules.  Thus, explicitly
build those modules against a (guix config) module that uses all the
default values.  That way, a Guix installation that uses different
config values can still benefit from substitutes.

Reported by Ricardo Wurmus.

* guix/self.scm (%default-config-variables): New variable.
(make-config.scm): Add #:config-variables and honor it.
(compiled-guix)[*core-modules*]: Pass #:config-variables to
'make-config.scm'.

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