[Bug 292630] textproc/groff: make gropdf handle UTF-8 escape sequences from preconv

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292630

            Bug ID: 292630
           Summary: textproc/groff: make gropdf handle UTF-8 escape
                    sequences from preconv
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: fbsd@opal.com

Created attachment 267362
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=267362&action=edit
patch to handle UTF-8 \[u00(..)] characters

groff -k invokes pre-processor preconv(1) which converts UTF-8 input characters
to \[uNNNN] sequences.

groff's -Tpdf post-processor gropdf(1) is not correctly recognizing these
sequences and so they are printing as "\[uNNNN]" rather than as the intended
UTF-8 character.

Attached patch converts characters in the range \[u00(..)] to the corresponding
8-bit character allowing them to display correctly.  Additional work will be
needed to support UTF-8 characters in other ranges.

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