[Pidgin] #8526: Add proper GnuTLS checks

[Pidgin]

#8526: Add proper GnuTLS checks
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 Reporter:  QuLogic    |           Owner:  elb  
     Type:  defect     |          Status:  new  
Component:  libpurple  |         Version:  2.5.4
 Keywords:             |   Launchpad_bug:       
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 We need proper checks for the new GnuTLS changes from
 [c84a41f40179331c218ac05005ce7805129049e5].

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Ticket URL: <http://developer.pidgin.im/ticket/8526>
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