[task #13658] Work on concave polygons too

[Sachin Kumar Singh]

Follow-up Comment #18, task #13658 (project gnuastro):

When I put 

printf("[%.3f, %.3f]\n", ipolygon[i*2], ipolygon[i*2+1]); 

inside the `POLYGON_MASK' macro in onecrop.c inside its `if' statement, after
the first 10 correct vertices(in shifted coordinates), it outputs a lot of
(0.000, 0.000) after the last correct point ((68.956700, 408.959500) in this
case).When I draw the polygon the bend is there due to this (0, 0) coordinate.
I think it's a garbage valve. If I try to prevent it using `if' statement, it
shows a segmentation fault. How to prevent it?

(file #48614)
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