Don't mess with $LOGNAME in nix-shell

Dependencies

• [2] VI32YSGA I should test first
• [3] DWQCLOPQ Tweaks for nix-shell
• [4] T4LLYESZ * Nix expression for building Hydra.
• [5] LOHWNXEJ Cleanup
• [6] YQWH4POV * Simplify.
• [7] RBZRCTAL hydra: fixed and re-enabled evaluation tests
• [8] NDJ6PZB7 * Fix symbol to look for.
• [9] V2ALOFRR Fix the test

Change contents

• replacement in release.nix at line 125
  [4.75]→[3.375:411](∅→∅)
  − preCheck = "patchShebangs .";
  [4.75]

  [4.1400]
  + preCheck = ''

  + patchShebangs .

  + export LOGNAME=${LOGNAME:-foo}

  + '';
• edit in release.nix at line 144
  [4.210]→[2.0:23](∅→∅),[2.23]→[4.211:212](∅→∅),[4.47]→[4.211:212](∅→∅)
  − LOGNAME = "foo";

  −