[Pidgin] #16106: support gif for purple_request_field_image_new

[Pidgin]

#16106: support gif for purple_request_field_image_new
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 Reporter:  xiehuc       |      Owner:
     Type:  enhancement  |     Status:  new
Milestone:               |  Component:  pidgin (gtk)
  Version:  2.10.9       |   Keywords:  git captcha
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 i write a plugin (pidgin-lwqq) and  using purple request api to show
 captcha for webqq.

 recently the server use animated gif as captcha, so i'm stucked.
 when i have time, i could try to commit a patch, although it's my first
 time to try commit for pidgin.

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Ticket URL: <https://developer.pidgin.im/ticket/16106>
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