[InterNetNews/inn] a3b50e: Fortify the normal build with -D_FORTIFY_SOURCE=2

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: a3b50e66af87bbc3d4bc7f5ae99cfec52923b736
      https://github.com/InterNetNews/inn/commit/a3b50e66af87bbc3d4bc7f5ae99cfec52923b736
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2022-01-22 (Sat, 22 Jan 2022)

  Changed paths:
    M configure.ac

  Log Message:
  -----------
  Fortify the normal build with -D_FORTIFY_SOURCE=2

Add -D_FORTIFY_SOURCE=2 for builds without warnings on.  It is now
enabled with "--enable-hardening-flags" (by default) instead of only
by "make warnings".