Snippets for discount 3.0.2.0 from Alpine riscv64

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-riscv64/community/discount/discount-3.0.2.0-r0.log.

• tools/300.c:5:1: warning: old-style function definition [-Wold-style-definition]
      5 | main(argc, argv)
        | ^~~~
  

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