These packages don't contain binaries or libraries. The dependencies
on the corresponding shared library packages are specified directly,
not generated by dpkg-shlibdeps.
This fixes build-time warnings from dpkg-gencontrol.
We already had support for disabling the tools build, used by
src:linux-grsec. However in this case, where we're using a different
based version to src:linux, we do still need to build the versioned
tools packages (linux-kbuild-4.9 and linux-perf-4.9). Split the
control template, config setting and rules accordingly.
(cherry picked from commit cb62c945f27ddee476631fa85c6aa67e50ed3bee)
Aurelien Jarno
Ben Hutchings
Hilko Bengen