Bug#1027889: use of dh_dkms without b-d: dh-dkms is a FTBFS

[Helmut Grohne]

Control: retitle -1 kpatch FTBFS: please switch to B-D: dh-sequence-dkms (or dh-dkms)
Control: tags -1 + ftbfs

Using dh_dkms without Build-Depends: dh-dkms makes the package ftbfs:

| make[1]: dh_dkms: No such file or directory
| make[1]: *** [debian/rules:23: override_dh_install] Error 127
| make[1]: Leaving directory '/<<PKGBUILDDIR>>'
| make: *** [debian/rules:11: binary] Error 2
| dpkg-buildpackage: error: fakeroot debian/rules binary subprocess returned exit status 2

Andreas filed the bug at serious severity, but it doesn't yet correctly
identify as FTBFS.

Helmut