Update fonts.conf to bold fonts from {gulim,batang}.ttc

. Fonts included in gulim.ttc and batang.ttc doesn't have actual
  bold fonts. Makes Fontconfig to make them bold when needs bold.
. Gives up Terminus.
. Includes Nanum Gothic Coding as a part of have-good-font-hinting
  group.

Signed-off-by: Kwanhong Lee <kwanhong.lee@gmail.com>