[task #16288] Warp: warn users when WCSLIB version is <7.12

[Pedram Ashofteh-Ardakani]

Follow-up Comment #5, task #16288 (project gnuastro):

On another note, using negations in conditionals makes the logic complex and
harder to understand. I'd suggest to replace the conditional from:


if(!(ver[0]>=7 && ver[1]>=12))exit(1);


To the simpler case shown below:


 if(ver[0]<7 && ver[1]<12)exit(1);


Less paranthesis and no more negations '!' :)


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