cfg: Add support for Cairo, GLib, GTK and ATK version check macros #8147
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Add CAIRO_VERSION_ENCODE() to fix undefined function-like macro error.
Add GLIB_CHECK_VERSION(), GTK_CHECK_VERSION() and ATK_CHECK_VERSION() to fix undefined function-like macro error.
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Without those known to cppcheck, it now bails out with something like this:
So define them in a best-effort fashion:
1as there's no better alternative than an arbitrary boolean value, and those checks are usually guarding newer or optional code paths, so it conceptually makes more sense to have a truthy value.