[Midnight Commander] #240: replace mhl's bool by stdbool.h

[Ticket System]

#240: replace mhl's bool by stdbool.h
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 Reporter:  metux    |       Owner:  metux
     Type:  defect   |      Status:  new  
 Priority:  major    |   Milestone:  4.7  
Component:  mc-core  |     Version:  4.6.2
 Keywords:           |    Blocking:       
Blockedby:           |  
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 Same like #239, but for the master branch.

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Ticket URL: <www.midnight-commander.org/ticket/240>
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