Log Message:
Update pidgin and friends to 2.4.3. Done during pkgsrc freeze because of:
 i) CVE-2008-2927 fix
ii) the previous version was being rejected from the ICQ network.
version 2.4.3 (07/01/2008):
libpurple:
* Yahoo! Japan now uses UTF-8, matching the behavior of official clients
  and restoring compatibility with the web messenger (Yusuke Odate)
* Setting your buddy icon once again works for Yahoo! accounts.
* Fixes in the Yahoo! protocol to prevent a double free, crashes on
  aliases, and alias functionality
* Fix crashes in the bonjour protocol
* Always use UTF-8 for Yahoo! (#5973)
* Fix a crash when the given jabber id is invalid.
* Make the IRC "unknown message" debugging messages UTF-8 safe.
* Fix connecting to ICQ
* Fix a memleak when handling jabber xforms.
Pidgin:
* Include the send button plugin in the win32 build
* Various memory leak fixes