archival/*: move "kbuild:" snippets into .c files

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
archival/*: move "applet:" snippets into .c files

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
archival/*: move "applet:" snippets into .c files, part 2

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
archival/*: move "config:" snippets into .c files

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>