hydra: add nix-prefetch-* to tarball

Dependencies

• [2] FV2M6MOT hydra: use autoconf/-make
• [3] FGI75W53 move nix-prefetch-* into tarball

Change contents

• replacement in src/script/Makefile.am at line 1
  [2.2198648]→[2.2198649:2198679](∅→∅)
  − EXTRA_DIST = hydra_control.sh
  [2.2198648]

  [2.2198679]
  + EXTRA_DIST = \

  + hydra_control.sh \

  + nix-prefetch-svn \

  + nix-prefetch-git \

  + nix-prefetch-hg

  +