Snippets for xterm 411 from Alpine riscv64

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-riscv64/community/xterm/xterm-411-r0.log.

• ./main.c:3308:1: warning: 'pty_search' defined but not used [-Wunused-function]
   3308 | pty_search(int *pty)
        | ^~~~~~~~~~