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

[Labib Asari]

Follow-up Comment #1, task #16288 (project gnuastro):

Hey Pedram, Im looking forward to solve this task.

I think this can be done by detecting the wcslib version while configure
script is run.

If the library is found we also detect its version using 
> pkg-config --modversion wcslib

and print a warning if its less than 7.12

A question I have in mind is, since wcslib is a mandatory dependency, should
this warning be included in a mandatory dependency missing section or the
optional dependency section?


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