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Fix #15179 (gtk.cfg: Complete and sort G_DEFINE_* list) #21453

Job	Run time
build_cmake (ubuntu:25.10, true, true)	2m 48s
build_make (ubuntu:25.10)	2m 16s
build_cmake (ubuntu:24.04, true, true)	2m 8s
build_make (ubuntu:24.04)	3m 26s
build_cmake (alpine:3.23, false, false)	4m 50s
build_make (alpine:3.23)	3m 26s
	18m 54s