[Bug 208966] [patch] man(groff) not supporting (pl_PL.)UTF-8 input

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208966

            Bug ID: 208966
           Summary: [patch] man(groff) not supporting (pl_PL.)UTF-8 input
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Keywords: easy, patch
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: cocsackie at gmail.com

`Man` uses `groff`, which is accepting only ascii as input - for example UTF-8
characters are not displayed correctly. Current version of `groff` is 1.19.2,
which doesn't support -k, -K and -D flags. Those flags are supported by `groff`
version 1.22.3 located in ports. Flags mentioned use `preconv` to escape
characters from the outside of ascii. `Preconv` is already present in the
FreeBSD.

How-To-Repeat:
1. create man page inside localized man directory
MANPATH/pl.UTF-8/man1/manproblem.1.gz with polish letters (ęóąśłżźćń)
2. Properly setup locale, fonts, keyboardmapping, etc.
export LANG=pl_PL.UTF-8
3. Show man page:
man manproblem

Proposed solutions:

1. Use newer version of `groff` and update `man` script (-D flag says to use
`preconv` as preprocessor to `groff` as well as specifies input encoding - this
was already proposed option in linked bug issue):

333c333
<               NROFF="$NROFF -D$nroff_dev -T$nroff_dev"
---
>               NROFF="$NROFF -T$nroff_dev"

2. Use `preconv` as preprocessor and update `man` script (doesn't require to
use port version of `groff`):

333c333
<               NROFF="$NROFF -T$nroff_dev"
---
>               NROFF="$PRECONV -D$nroff_dev | $NROFF -T$nroff_dev"

941a942
> PRECONV=preconv

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