Fix compilation#12

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Ace17 wants to merge 4 commits intoFrictionalGames:masterfrom

Ace17:fix_compilation

Commits on Jan 2, 2018

Fix compilation: invalid conversion from boolean to pointer
Sebastien Alaiwan
committed
Fix compilation: overloaded function with no contextual type information
Sebastien Alaiwan
committed
Fix compilation: add missing inclusion of unistd.h (required for 'symlink')
Sebastien Alaiwan
committed
Fix compilation: taking address of temporary
Sebastien Alaiwan
committed