remove redundant conditional compilation

Dependencies

• [2] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).
• [3] WXAFKN6J Do not call an external subcommand when the parsing of an existing subcommand fails
• [4] RJMQSZER External commands
• [5] YAJAXIV5 Unrecording changes atomically
• [6] AN7IDX26 pijul: added ChangesNotFound error variant
• [7] I52XSRUH Massive cleanup, and simplification

Change contents

• replacement in pijul/src/main.rs at line 177
  [2.88090]→[2.88090:88153](∅→∅)
  − if !cfg!(debug_assertions) {

  − setup_panic!();

  − }
  [2.88090]

  [2.88153]
  + setup_panic!();