The SystemD D-Bus configuration should only to be installed when
SystemD support is enabled.
(From OE-Core rev: e658ee16dc026b96f67a4c9666d3eb7bf7027de3)
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>