[task #13658] Work on concave polygons too

[Sachin Kumar Singh]

Follow-up Comment #21, task #13658 (project gnuastro):

Two new functions are added in `polygon.c' and pushed to `task-is-in-polygon'
branch :
[https://github.com/sachinkumarsingh092/gnuastro/tree/task-is-in-polygon] 

Also, I figured out the problem with the extra point and fixed it manually,
but need to implement it as a general solution. The problem is that my
function need n+1 points(the last edge from v[n-1] to v[0] is also required).
We can do this by checking the type of polygon. If it is concave, we need to
`realloc(ipolygon, 2*(nvertices+1)*sizeof *ipolygon)` the `ipolygon` to insert
2 more points(the first points) and similarly ordinds. But while doing so,
error arise:
` ignoring return value of ‘realloc’, declared with attribute
warn_unused_result`.

How to implement my function so that it can use the n+1 points?



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