The dynamic completion of the variants is broken since 1946aaca87
("fff: create proper package variants instead of copying file").
This hardcodes the available variants. They won't change often.
Signed-off-by: Robert Langhammer <rlanghammer@web.de>
[add more verbose commit reference]
Reviewed-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>