Snippets for argp-standalone 1.5.0 from Nix aarch64-linux

Sourced from https://hydra.nixos.org/log/q1crwh73cghxw30p4cmv8j1lhilg00rq-argp-standalone-1.5.0.drv.

• ../argp-help.c:1724:2: warning: #warning No reasonable value to return [-Wcpp]
   1724 | #warning No reasonable value to return
        |  ^~~~~~~
  

• ../argp-help.c:1870:22: warning: unused variable 'buf' [-Wunused-variable]
   1870 |                 char buf[200];
        |                      ^~~