tiffcrop correctly update buffersize after rotateImage() fix#520

Su Lausrequested to merge
Su_Laus/libtiff:tiffcrop_correctly_update_buffersize_after_rotate_fix#520 into master

rotateImage() set up a new buffer and calculates its size individually. Therefore, seg_buffs[] size needs to be updated accordingly. Before this fix, the seg_buffs buffer size was calculated with a different formula than within rotateImage().

Closes #520 (closed)

Edited by Su Laus

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