meson: Override dependencies to improve usage as a subproject

With this change, gdk-pixbuf can be consumed as a subproject without
making any changes to the build files of a project. All you need to do
is provide a wrap file with a `[provide]` section:

https://mesonbuild.com/Wrap-dependency-system-manual.html#provide-section

This is also necessary because otherwise projects need to hard-code
the subproject name, which might be `gdk-pixbuf` when using `wrap-git`
or `gdk-pixbuf-2.42.10` when using `wrap-file` (to build from
a release tarball). This can cause conflicts between different
subprojects that consume gdk-pixbuf differently.

Other projects like glib, cairo, pango, etc already do this.

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