[bug#49198] [PATCH core-updates] fix gobject-introspection cairo library path

[John Kehayias]

Hello,

This is a patch to fix issue #49122 (gobject-introspection and not finding 
cairo). The patch changes the cairo typelib file to include the absolute path 
to the cairo patch (as required by libraries that use introspection via gir) by 
modifying the input file. I believe this is exactly what is done in nix to 
solve the same issue, see https://github.com/NixOS/nixpkgs/issues/34080 for 
their discussion and fix.

I believe this necessitates building with a cairo dependency to have the 
library path available, but correct me if I'm wrong as I'm new to guix. I've 
used cairo-sans-poppler to avoid the dependency cycle. I've tested this builds 
and solves issue #49122 for me.

Thanks!
John

gobject-introspection-cairo-library-location.patch
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