* gnu/packages/crates-gtk.scm (rust-glib-macros-0.17): New variable. (rust-glib-macros-0.15): Inherit from rust-glib-macros-0.17.
* gnu/packages/crates-gtk.scm (rust-glib-macros-0.17): New variable. (rust-glib-macros-0.15): Inherit from rust-glib-macros-0.17.