Fixes <https://issues.guix.gnu.org/73275>.
This is presumably what e529d46828 meant
to do, except that it wrongfully pass #:symlink? a true value instead,
most likely due to a typo.
* guix/gexp.scm (imported-files): Pass #:symlink? #f.
* tests/gexp.scm ("imported-files does not create symlinks"): New test.
Change-Id: Ic31be56a2adf4dfa55e1ec390c53cc9ba5f8a96c