2022-05-04  Kjell Ahlstedt  <[email protected]>

 2.66.4

2022-05-04  Kjell Ahlstedt  <[email protected]>

 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