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

[Labib Asari]

Follow-up Comment #3, task #16288 (project gnuastro):

Hey Pedram, I worked upon this and here's what I could come up with :
https://github.com/labeeb-7z/GnuAstro/tree/wcslib-version-warning

The approach I took is 
 - detect if wcslib is present
   - if its present, detect its version using _wcslib_version_ function. 
   - if it is older than 7.12, set _wcslib_version_old_ to yes, else no

Finally I print some warnings in _Configuration Warnings_ section if
_wcslib_version_old_ is yes

I've also tested and built it locally without any errors.

Let me know if this can improved any further, or I should move ahead by
sending a pull request.


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