INSTALLATION_DIRS, as well as all occurrences of ${PREFIX}/man with
${PREFIX}/${PKGMANDIR}.
Fixes PR 35265, although I did not use the patch provided therein.
1. Added --guess option which print guessed character encoding.
2. Added --cp932inv options which enable to make some characters
conversion compatible with Code Page 932 (CP932) when converting
to Shift_JIS.
3. Added --prefix option. When converting to Shift_JIS, second byte of
converted character may be "meta" character. --prefix option allow
escape these characters.
4. Added support for JIS X 0212.
