gdk-sys: test failed on fedora copr

[ghost]

Bug description

---- cross_validate_constants_with_c stdout ----
Constant value mismatch for GDK_MICRO_VERSION
Rust: "23"
C: "29"
thread 'cross_validate_constants_with_c' panicked at 'FAILED: 2734 passed; 1 failed', tests/abi.rs:107:13

https://download.copr.fedorainfracloud.org/results/remilauzier/gtk/fedora-rawhide-x86_64/02305839-rust-gdk-sys/builder-live.log.gz

[sdroege]

These version constants should be ignored in the Gir.toml. Do you want to submit a PR for that?

[bilelmoussaoui]

There is already an issue about this #13