bootstrap: %bootstrap-inputs: Wrap input lists into thunks.

* gnu/packages/bootstrap.scm (%bootstrap-inputs): Change to procedure.  Update
users; prepares for Mes bootstrap.
* gnu/packages/commencement.scm (%boot0-inputs, %boot1-inputs, %boot2-inputs,
%boot3-inputs, %boot4-inputs, %boot5-inputs, %boot-6-inputs): Change to
procedure.  Update users.
* tests/builders.scm (%bootstrap-inputs, %bootstrap-search-paths): Make a
procedure, filter on package?.  Update users.

1 files changed, 3 insertions, 2 deletions

diff --git a/tests/union.scm b/tests/union.scm
index 5a6a4033fcb..5599625447b 100644
--- a/tests/union.scm
+++ b/tests/union.scm
@@ -94,8 +94,9 @@
                          `(,name ,(package-derivation %store package))))
 
                        ;; Purposefully leave duplicate entries.
-                       (append %bootstrap-inputs
-                               (take %bootstrap-inputs 3))))
+                       (filter (compose package? cadr)
+                               (append (%bootstrap-inputs)
+                                (take (%bootstrap-inputs) 3)))))
          (builder `(begin
                      (use-modules (guix build union))
                      (union-build (assoc-ref %outputs "out")