Snippets for discount 3.0.1.3 from Nix aarch64-linux

Sourced from https://hydra.nixos.org/log/ja4fs2ialgl9jhax6ijjh6jz2d2hm7aj-discount-3.0.1.3.drv.

• main.c:137:9: warning: ignoring return value of 'write' declared with attribute 'warn_unused_result' [-Wunused-result]
    137 |         write(tochild[SENDER], src, len);
        |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  

• main.c:159:9: warning: ignoring return value of 'system' declared with attribute 'warn_unused_result' [-Wunused-result]
    159 |         system(external_formatter);
        |         ^~~~~~~~~~~~~~~~~~~~~~~~~~
  

• tools/rep.c:37:1: warning: old-style function definition [-Wold-style-definition]
     37 | main(argc, argv)
        | ^~~~