libxslt: 1.1.32 -> 1.1.33, cleanup

* Drop SunOS patch -- likely didn't apply anyway,
  and appears has been fixed upstream 2 years ago:
  https://gitlab.gnome.org/GNOME/libxslt/commit/7471cc6e8ff5448e00b0ae1096f0d9fbe13163d1

* changelog mentions cygwin build/linking fixes,
  so dropping those touchups optimistically