* Fix hydra_eval_jobs.

Dependencies

• [2] 77VF5TC6 * For ease of use during debugging, don't require --gc-roots-dir.
• [3] A63IHCMX * Register GC roots properly.
• [*] 4N5APGRG * Start of a helper tool to evaluate job expressions efficiently.

Change contents

• replacement in src/c/hydra_eval_jobs.cc at line 159
  [2.104]→[2.104:178](∅→∅)
  − if (!pathExists(root)) addPermRoot(drvPath, root, false);
  [2.104]

  [2.178]
  + if (!pathExists(root)) addPermRoot(*store, drvPath, root, false);