headers.h: fix windows build
headers.h: fix windows build

Hopefully :)
wiggi/huntercoin,chronokings/huntercoin,chronokings/huntercoin,fsb4000/huntercoin,domob1812/huntercoin,domob1812/huntercoin,fsb4000/huntercoin,wiggi/huntercoin,domob1812/huntercoin,chronokings/huntercoin,wiggi/huntercoin,wiggi/huntercoin,chronokings/huntercoin,fsb4000/huntercoin,domob1812/huntercoin,fsb4000/huntercoin