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man: turn on troff -mnihongo if JP font is used

This specifically fixes
	% man -P ktrans

We dont have font widths for kanji in our troff
font files, so we can use aux/mnihongo to render
the character using libdraw, and grab the bitmap from
there. It's not pretty, but aux/mnihongo exists so
lets at least use it.

This also updates /sys/man/1/ktrans to specify the
Jp font to comply with aux/mnihongo.

--- a/rc/bin/man

+++ b/rc/bin/man

@@ -11,6 +11,7 @@

 fn roff {

 	preproc=()

+	Jpflag=()

 	postproc=cat

 	x=`{doctype $2}

 	if (~ $1 t) {

@@ -19,6 +20,8 @@

 		if(~ $x *pic*)

 			preproc=($preproc pic)

 		Nflag=-Tutf

+		if(grep -s '^.ft Jp|\f\[Jp\]' $2)

+			Jpflag='-mnihongo'

 	}

 	if not {

 		Nflag='-N'

@@ -34,17 +37,17 @@

 	{echo -n $FONTS; cat $2 </dev/null} |

 		switch($#preproc) {

 		case 0

-			troff $Nflag $Lflag -$MAN 

+			troff $Nflag $Lflag -$MAN $Jpflag

 		case 1

-			$preproc | troff $Nflag $Lflag -$MAN

+			$preproc | troff $Nflag $Lflag -$MAN $Jpflag

 		case 2

-			$preproc(1) | $preproc(2) | troff $Nflag $Lflag -$MAN

+			$preproc(1) | $preproc(2) | troff $Nflag $Lflag -$MAN $Jpflag

 		case 3

 			$preproc(1) | $preproc(2) | $preproc(3) |

-				troff $Nflag $Lflag -$MAN

+				troff $Nflag $Lflag -$MAN $Jpflag

 		case *

 			$preproc(1) | $preproc(2) | $preproc(3) |

-				$preproc(4) | troff $Nflag $Lflag -$MAN

+				$preproc(4) | troff $Nflag $Lflag -$MAN $Jpflag

 		} | $postproc

 }

--- a/sys/man/1/ktrans

+++ b/sys/man/1/ktrans

@@ -86,8 +86,10 @@

 .SH EXAMPLES

 If you want to make the Japanese text as below:

+.ft Jp

 私は毎日35分以上歩いて、 更に10分電車に乗って学校に通います。

  健康の維持にも役だっていますが、 なかなかたのしいものです。

+.ft

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