pidgin security and bug fix update

2.5.8-1 - 2.5.8 with several important bug fixes 2.5.7-2 - glib2 compat with RHEL-4 2.5.7-1 - 2.5.7 with Yahoo Protocol 16 support 2.5.6-1 - 2.5.6 2.5.5-3 - F12+ removed krb4...