Merge pull request #1581 from PJungkamp/signal/accumulator #4027

Job	Run time
build GTK binaries with gvsbuild	11s
build gtk-rs on Windows (cairo, true, --features png,pdf,svg,ps,use_glib,v1_16,freetype,script,wi...	2m 28s
build gtk-rs on Windows (gdk-pixbuf, true, --features v2_42)	1m 28s
build gtk-rs on Windows (gio, true, --features v2_80)	2m 29s
build gtk-rs on Windows (glib, true, --features v2_80)	4m 16s
build gtk-rs on Windows (glib-build-tools, false)	2m 24s
build gtk-rs on Windows (graphene, false)	1m 59s
build gtk-rs on Windows (pango, true, --features v1_52)	2m 8s
build gtk-rs on Windows (pangocairo, true)	2m 47s
build gtk-rs on Windows (examples, false, --bins --examples --all-features)	2m 31s
	22m 41s

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