Fix #67447: imagecrop() adds a black line when cropping #1373
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A simple one-off error: imagecrop)() copied only width-1 and height-1 pixels.
Apparently, the loops are running until
< -1instead of<= -1, but perhaps I'm overlooking something. @pierrejoye @remicollet: okay to merge? PHP 5.6+?BTW, the external libgd is not affected, because it's delegating to gdImageCopy().