sysvint: convert to gentargets and bump to 2.88

Also, changed the site to Debian, to get the latest patches

[ Thomas: add inittab compatible with sysvinit. Minor fixes. ]

Signed-off-by: Martin Banky <Martin.Banky@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>