Revert "add gtk2 HC icons"

This reverts commit bfe89c36bd40777767899e1d55f0408a2e6bee05.
Revert "Remove a reference to themes/Adwaita/gtk-2.0/Makefile"

This reverts commit ce6254d0887ecced53344cbabb45159832e91369.
Revert "don't include themes/Adwaita/gtk-2.0 as a subdir"

This reverts commit 916d868dc95639c772a32a693546bb3e4e138fa4.