[Pidgin] #16764: Pidgin/finch fails to build against ncurses 6.0 with WINDOW_OPAQUE set to 1

[Pidgin]

#16764: Pidgin/finch fails to build against ncurses 6.0 with WINDOW_OPAQUE set to 1
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 Reporter:  dimstar  |       Owner:  EionRobb
     Type:  defect   |      Status:  new
Milestone:           |   Component:  unclassified
  Version:  2.10.11  |  Resolution:
 Keywords:           |
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Comment (by bjoernv):

 The bug exists in default branch (Pidgin 3.0) too. The patch fixes the
 compilation errors.

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Ticket URL: <https://developer.pidgin.im/ticket/16764#comment:5>
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