Due to circular dependencies, referring to bindings exported by other
modules from the top level is frowned upon. This patch addresses one of
the remaining cases.
* gnu/packages/base.scm (%final-inputs): New procedure.
* gnu/packages/cross-base.scm: Remove (gnu packages commencement) import.
(cross-gcc): Use the new '%final-inputs'.
* gnu/packages/make-bootstrap.scm: Remove (gnu packages commencement) import.
(package-with-relocatable-glibc): Use the new '%final-inputs'.
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