Log Message:
Update pidgin IM suite to version 2.2.1 during freeze to fix the DoS
vulnerability CVE-2007-4996:
"MSN nudges sent from unknown buddies can cause libpurple to crash"

Other changes:

libpurple:
* A few build issues on Solaris were fixed.
* Cancelling the password prompt for an account will no longer leave
  it in an ambiguous state.  (It will be disabled.)
* Fixed an erroneous size display for MSN file transfers. (galt)
* Fixed multiple memory leaks, particularly in XMPP and MySpace protocols
* Fixed remembering proxy preferences and status scores
* Gmail notifications are better tracked

Pidgin:
* Fixed keyboard tab reordering to move tabs one step instead of two.
* You should no longer lose proxy settings when Pidgin is restarted.
* Fixed detection of X11 when compiling

Finch:
* Pressing 'Insert' in the buddylist will bring up the 'Add Buddy'
dialog.