Revert "Remove a reference to themes/Adwaita/gtk-2.0/Makefile"
Revert "Remove a reference to themes/Adwaita/gtk-2.0/Makefile"

This reverts commit ce6254d0887ecced53344cbabb45159832e91369.

Distrotech/gnome-themes-standard,DoctorJellyface/gnome-themes-standard,DoctorJellyface/gnome-themes-standard,Distrotech/gnome-themes-standard