[task #13658] Work on concave polygons too

[Mohammad Akhlaghi]

Follow-up Comment #42, task #13658 (project gnuastro):

One more minor stylistic point: 

When you have a simple test, its much elegant/readable/less-buggy to use the
`?:' structure, rather than repeating something.

For the return value of `polygon_leftof_vector', you have such a statement. So
its better to write it like this:


return test ? (test>0 ? 1 : -1) : 0;


Also, please define variables at the top of functions, not in the middle of
its operations (as discussed in Comment 55 of Task 15567
<https://savannah.gnu.org/task/?15567#comment55>.

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