(svn r862) Cygwin: libdetection now sets the flags properly if no Makefile.config is found
Cygwin: workaround: libpng is automatically not used even if present until the Cygwin/libpng problem is solved

static const byte _dir_to_straight_trackdir[4] = {
	0, 1, 8, 9,
};

static const byte _reverse_dir[4] = {
//	3, 0, 1, 2
	2, 3, 0, 1
};