Log Message:
Update pear-HTML_Common to 1.2.3.

Changes in 1.2.3:
* Added setAttribute() method (backport from HTML_Common2)
* Added possibility to set the charset parameter for htmlspecialchars()
  via static HTML_Common::charset() method (see bug #2410)
* Properly document getAttribute() method (bug #5704), fix PHPDoc comments
  for several other methods

Changes in 1.2.2:
- fixed bug #3948 (semicolon after case in switch)
- fixed bug #3953 (outdated inline docs for a private function)
- updated some other inline docs for private functions

Adressess PR pkg/34468 by Martin Wilke