remove nix from buildinputs

Dependencies

• [2] WYM574OI add nix to buildinputs
• [3] M3A5PZIH hydra: Clarify the dependency on BDW-GC.
• [4] UHMUHQMU hydra: fix tarball build, add pre suffix to tarballs
• [*] T4LLYESZ * Nix expression for building Hydra.

Change contents

• replacement in release.nix at line 20
  [3.60]→[2.0:77](∅→∅)
  − [ perl libxslt dblatex tetex nukeReferences pkgconfig boehmgc nix] ;
  [3.60]

  [3.76]
  + [ perl libxslt dblatex tetex nukeReferences pkgconfig boehmgc ] ;