Upstream made some changes without changing the version number.

Deal with that by bumping PKGREVISION, and using a DIST_SUBDIR.  The
DIST_SUBDIR name contains the date when upstream made the change, in
case they do it again.

The changes are small bug fixes (verified by comparing the
unpacked files).  I will also ask upstream not to do this again.
Remove two patches to avoid conflict with files/.
These patches are stored in files/.
Update skf to 1.99.7.

skf (1.99.7)

  * ruby 2.1.0 support
  * fix bug in MIME encoding under early_mime_out mode
  * further nkf-compatibility
  * trim some terminal sequence sweep behaviors
  * UnicodeData undated to 6.3
  * fix nkf compatible option --cp932 behavior
  * fix some bugs
Updated converters/skf to 1.99.7