Log segfaults from the evaluator

Dependencies

• [2] A43SLRSH Fix handling of IPC::Run::run exit status
• [3] 3XTHEUMP * Implemented the clone feature.
• [4] CHQEG6WY Hydra/29: Added timeout to svn/git checkouts, job evaluation
• [*] OOQ2D3KC * Refactoring: move fetchInput out of hydra_scheduler into a separate

Change contents

• replacement in src/lib/Hydra/Helper/AddBuilds.pm at line 738
  [2.3465]→[2.3465:3549](∅→∅)
  − die "cannot evaluate the Nix expression containing the jobs:\n$stderr" if $res;
  [2.3465]

  [3.3181]
  + if ($res) {

  + die "$evaluator returned " . ($res & 127 ? "signal $res" : "exit code " . ($res >> 8))

  + . ":\n" . ($stderr ? $stderr : "(no output)\n");

  + }