download: Use correct system and guile in 'url-fetch/tarbomb' and 'url-fetch/zipbomb'.

Fixes <https://bugs.gnu.org/40115>.

Previously the result of `guix build -s $system $package' would depend on the
system Guix was built for if $package or one of its dependencies used
'url-fetch/tarbomb' or 'url-fetch/zipbomb' as the origin method of its
source (e.g. `guix build -s i686-linux ffmpeg' on i686-linux would build a
different derivation than on x86_64-linux).

This patch fixes this by explicitly passing the correct system and guile to
'gexp->derivation'.

* guix/download.scm (url-fetch/tarbomb): Pass #:system system and
  #:guile-for-build guile to 'gexp->derivation', where guile is the derivation
  of guile for system.
  (url-fetch/zipbomb): Likewise.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

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