gnome: Tweak error message
gnome: Tweak error message

It's an easy mistake to do this:

    gir1 = gnome.generate_gir(...)
    gir2 = gnome.generate_gir(...
        includes: ['GObject-2.0', gir1])

This fails with an error:

    ERROR: Gir includes must be str, GirTarget, or list of them.

The issue is that the 'gir1[0]' should be passed instead of 'gir1'.
To make the problem slightly clearly, tweak the error message to be:

    ERROR: Gir includes must be str, GirTarget, or list of them. Got TypelibTarget.

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