Fix several issues backported from upstream:
3c30f64efedafc379b6536852bbb3b6ef5f1f6c9 - fix for receiving HTML on ICQ
13fbe0815f84d5b3c001947559f5818c10275f4c - prevent null deref on
disconnecting account (#592750)
c4a874926d07b8597db4b78a181a89cf720a8418 - fix blinking tray icon on
new message (#592691) cfe0e649dda34d9252d40d8f67e445336a247998 -
prevent race condition on Yahoo! login
e3dd36706068f3b8eabd630ff71d270c145cce42 - fix crash in Oscar (#548128)
13fbe0815f84d5b3c001947559f5818c10275f4c - fix crash during network
disconnect (#592750)