bug#49122: gobject-introspection and not finding cairo

[Raghav Gururajan]

Hi John!

You could try creating a gobject-introspection variant with cairo 
enabled and use that variant as native-input for your packages.

Something like this:

```
(define-public gobject-introspection+cairo
  (hidden-package
   (package
     (inherit gobject-introspection)
     (arguments
      (substitute-keyword-arguments (package-arguments 
gobject-introspection)
        ((#:configure-flags flags ''())
         `(cons* "-Dcairo=true" ,flags))))
     (inputs
      `(("cairo" ,cairo)
        ,@(package-inputs gobject-introspection))))))
```

Regards,
RG.

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