2022-05-04  Kjell Ahlstedt  <kjellahlstedt@gmail.com>

  2.66.4

2022-05-04  Kjell Ahlstedt  <kjellahlstedt@gmail.com>

  Glib::ustring_Iterator: Accept a warning from clang++

  The fix in commit 94ab1e5359f3bd9eb8204aadea88e08f52a291d8
  broke ABI. Revert the modification of ustring_Iterator.
  It's difficult to avoid a -Wdeprecated-copy warning from clang++
  without either removing or adding ABI.
  Fixes #98