purple_conv_chat_cb_find's use of g_utf8_collate

[Zachary West]

Howdy,

purple_conv_chat_cb_find() uses g_utf8_collate() to find
PurpleConvChatBuddys, but this is a _very, very_ slow function, taking
up a significant chunk of time when dealing with it.

Is there any reason for this function to be using g_utf8_collate()
instead of purple_strequal() and purple_normalize()ing the nicks? It's
just trying to identify which nicks are equal, does it need to take
the locale into consideration?

Thanks,

Zac West