glib: Add glib-macros / glib 0.20.3 dependency#1527

sdroege merged 1 commit intogtk-rs:0.20gtk-rs/gtk-rs-core:0.20from

sdroege:0.20-glib-0.20.3-depsdroege/gtk-rs-core:0.20-glib-0.20.3-depCopy head branch name to clipboard