update-rc.d: don't do anything if systemd.bbclass is inherited
We need the update-rc.d class to work when systemd is being used so that
packages that only have SysV init scripts still work. However if a recipe
supports both we don't want to install SysV and systemd files under systemd.
To solve this, before doing real work in update-rc.d check if the systemd class
has been inherited and don't do anything if it has.
Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
