bug#26594: guix pull --bootstrap does not work

[Andy Wingo]

I did a "guix pull" and it carped that there was a 404 for the bash-4.4A
NAR, and suggested --fallback.  But there is no --fallback argument to
guix pull for some reason.  OK.  There's a --bootstrap argument but
although it can install the deps, it can't pull, because:

  In unknown file:
     ?: 0 [dynamic-func "strverscmp" #<dynamic-object #f>]

  ERROR: In procedure dynamic-func:
  ERROR: In procedure dynamic-pointer: Symbol not found: strverscmp
  builder for `/gnu/store/jagbm4f9npc7n7l9y4b1ncc25vigylky-guix-latest.drv' 
failed with exit code 1
  guix pull: error: build failed: build of 
`/gnu/store/jagbm4f9npc7n7l9y4b1ncc25vigylky-guix-latest.drv' failed

I would guess this is because the bootstrap Guile is statically linked.

Andy