Snippets for aha 0.5.1 from Nix aarch64-darwin

Sourced from https://hydra.nixos.org/log/5yi6w2qzhanpq0sjn3sl9dd0xzws1hla-aha-0.5.1.drv.

• aha.c:1146:35: warning: unknown warning group '-Wimplicit-fallthrough=', ignored [-Wunknown-warning-option]
   1146 |                         #pragma GCC diagnostic ignored "-Wimplicit-fallthrough="
        |                                                        ^
  

• aha.c:691:6: warning: variable 'momline' set but not used [-Wunused-but-set-variable]
    691 |         int momline=0;
        |             ^