textproc/gnugrep: update GNU grep to version 3.8
- PCRE option is now backed by `devel/pcre2' port
- Remove seemingly useless macro from the manpage in order to drop dependency on `textproc/groff' as suggested by Dan Allen
Reported by: portscout
textproc/gnugrep: update GNU grep to version 3.8 Tags None Referenced Files None Subscribers None
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