[InterNetNews/inn] ba875c: Add the "make reformat" command

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: ba875c40dd5afaddb2aea808bb2c2b71982dd38d
      https://github.com/InterNetNews/inn/commit/ba875c40dd5afaddb2aea808bb2c2b71982dd38d
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2021-10-31 (Sun, 31 Oct 2021)

  Changed paths:
    M Makefile

  Log Message:
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  Add the "make reformat" command

Useful to reformat all C code with clang-format.