WCSLIB needs -lcfitsio on some systems

Until now, we were relying on WCSLIB's internal checking and linking with
CFITSIO. But on one macOS system (not others that had no problem!), we
noticed that it complains with undefined symbol linking errors to CFITSIO
libraries.

With this commit, as a fast/ugly solution, we are explicity adding
`-lcfitsio' to WCSLIB's `LIBS' variable so all binaries are linked with it
automatically. We'll be in touch with the WCSLIB author to see if a better
solution can be found.

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