tex-baekmuk{,-doc}: update to 2.2.1

- Replace buggy version 2.0 `post` tables with version 3.0 ones,
  which indicate that the font doesn't contain glyph names.
  This is common for CJK fonts that are accessed by character code only.

- Set the font revision to 4.1 and the font version to 2.0.1 in all fonts
  to emphasize that they belong together, which makes sense IMHO because
  the fonts are no longer under development.

(markd)