Security update for finch, libpurple and pidgin (important)

Various remote triggerable crashes in pidgin have been
fixed:

• CVE-2012-1178: In some situations the MSN server
  sends text that isn’t UTF-8 encoded, and Pidgin fails to
  verify the text’s encoding. In some cases this can lead to
  a crash when attempting to display the text ().
• CVE-2012-1178/CVE-2012-2318: Incoming messages with
  certain characters or character encodings can cause clients
  to crash.
• CVE-2012-2214: A series of specially crafted file
  transfer requests can cause clients to reference invalid
  memory. The user must have accepted one of the file
  transfer requests.