[Pidgin] #3634: Add a function to set the CA cert search path.

[Pidgin]

#3634: Add a function to set the CA cert search path.
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 Reporter:  fqueze     |       Type:  patch
   Status:  new        |   Priority:  minor
Component:  libpurple  |    Version:  2.2.1
 Keywords:             |    Pending:  0    
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 This is needed for Instantbird.

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Ticket URL: <http://developer.pidgin.im/ticket/3634>
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