Snippets for emacs 31.1 from Alpine ppc64le

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-ppc64le/community/emacs/emacs-31.1-r0.log.

• character.c:620:3: warning: 'memmove' specified bound between 9223372036854775808 and 18446744073709551615 exceeds maximum object size 9223372036854775807 [-Wstringop-overflow=]
    620 |   memmove (endp - nbytes, p, nbytes);
        |   ^