Appveyor: install libstd
Appveyor: install libstd

EPashkin/rust-gnome-gtk,daa84/gtk,rust-gnome/gtk,EPashkin/rust-gnome-gtk,gkoz/rust-gnome-gtk,gkoz/gtk-rs-gtk,Susurrus/gtk,rust-gnome/gtk,gkoz/rust-gnome-gtk,gkoz/gtk-rs-gtk,Susurrus/gtk,daa84/gtk