databases/postgis34: remove devel/pcre dependency

databases/postgis34 depends (unnecessarily) on devel/pcre when ADDRSTD is set (default). It no longer needs this as it uses devel/pcre2 that is unconditionally depended on.

Remove the ADDRSTD dependency on devel/pcre

PR: 279565
Approved by: lbartoletti@FreeBSD.org (maintainer)