Add OpenSSL as a dependency because Nix needs it

Dependencies

• [2] NDJ6PZB7 * Fix symbol to look for.
• [3] HJECG75O hydrA: add some pkgs to buildinputs for tests
• [4] XCHBOA3S svn -> subversion
• [5] U2BNO3C5 hydra: fix build job
• [6] UHMUHQMU hydra: fix tarball build, add pre suffix to tarballs
• [7] WSCHBYEN add topgit to hydra's path
• [8] T4LLYESZ * Nix expression for building Hydra.
• [9] FSZJXAHR add sqlite to buildinputs
• [10] YQWH4POV * Simplify.
• [11] VM3TQZ65 * hydra: make manual.pdf
• [12] X5QBLQDG
• [13] M3A5PZIH hydra: Clarify the dependency on BDW-GC.

Change contents

• replacement in release.nix at line 59
  [3.1780]→[2.70:208](∅→∅)
  − [ perl makeWrapper libtool nix unzip nukeReferences pkgconfig boehmgc sqlite git gitAndTools.topGit mercurial subversion bazaar ]
  [3.1780]

  [3.1817]
  + [ perl makeWrapper libtool nix unzip nukeReferences pkgconfig boehmgc sqlite git gitAndTools.topGit mercurial subversion bazaar openssl ]