Set the build status properly for failing local builds

Dependencies

• [2] BD3GRK4B * Get rid of "positive failures" and separate log phases.
• [3] UVNQPK3T Hydra/56: handle failed builds with result only at build level, not buildsteps
• [4] HE3GX5IP Optimize fetch-git.
• [5] G3IUM7VL hydra: add support for succeedOnFailure feature in stdenv
• [6] 7YBYT2LQ

Change contents

• replacement in src/script/hydra-build at line 371
  [2.4051]→[2.4051:4107](∅→∅)
  − if ($thisBuildFailed) { $buildStatus = 1; }
  [2.4051]

  [2.4107]
  + if ($thisBuildFailed && $res == 100) { $buildStatus = 1; }