gtk4: Disable integer conversion warning as error

[kraj]

clang 15+ has started to treated int-conversion as error and pipeline cache code added snippets[1] in gtk4 which causes this error

[1] https://gitlab.gnome.org/GNOME/gtk/-/commit/684a015c9852ede9d57103852217b428546fe472 Signed-off-by: Khem Raj raj.khem@gmail.com

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