[PATCH 1/3] [gdb/contrib] Factor out grep_or and sed_or in spellcheck.sh

[Alexandra Petlanova Hajkova]

>
>  usage ()
>  {
>
> base-commit: 23ca0175c66b1add6fe51efc160628c824f6d32f
> --
> 2.35.3
>
> Looks great, and also works perfectly on aarch64.

Reviewed-By: Alexandra Petlanova Hajkova <ahajkova@redhat.com>
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