[Pidgin] #3528: libpurple buddyicon fix write

[Pidgin]

#3528: libpurple buddyicon fix write
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 Reporter:  eperez     |       Type:  patch
   Status:  new        |   Priority:  minor
Component:  libpurple  |    Version:  2.2.1
 Keywords:             |    Pending:  0    
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 This patch makes the function purple_buddy_icon_data_cache() write icon
 files atomically to prevent corrupt files and make code easier to read.

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Ticket URL: <https://developer.pidgin.im/ticket/3528>
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