Without this change, there will be two sstate index files in
tmp/sstate-control for any machine that contains a dash in the
name.
(From OE-Core rev: 29e7799bdb3773c40492e01448e0c614ed44583d)
Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>