gtk.cfg: Add G_DEPRECATED_FOR and G_ENCODE_VERSION

[correctmost]

G_DEPRECATED_FOR is defined in glib/gmacros.h.
G_ENCODE_VERSION is defined in glib/gversionmacros.h.

[danmar]

I accept this change, there is no test added and therefore I assume you will make sure it will work properly.

have you been added in the AUTHORS file?

[correctmost]

I accept this change, there is no test added and therefore I assume you will make sure it will work properly.

I should've mentioned that I tested the changes on https://github.com/GNOME/pango, which uses both macros.

Before this change, I would get quick failures:

pango/pango-version-macros.h:385:2 failed to evaluate #elif condition, undefined function-like macro invocation: G_ENCODE_VERSION( ... )
pango/pango-script.h:309:1 There is an unknown macro here somewhere. Configuration is required. If G_DEPRECATED_FOR is a macro then please configure it.

have you been added in the AUTHORS file?

No credit is really needed :). I'm just trying to reduce some false positives I see when checking Xfce and GNOME code.

Thank you!