Fix passing arguments to the reproduction script

Dependencies

• [2] EE5GSP2L reproduce.tt: Wrap script to prevent problems piping into bash
• [3] UROSQNYP reproduce.tt: Add --print-flags option
• [*] HZWUT4YN Allow users to reproduce builds on their own systems

Change contents

• replacement in src/root/reproduce.tt at line 219
  [2.15]→[2.15:20](∅→∅)
  − main
  [2.15]
  + main "$@"