fix: build ooniprobe for linux using debian/amd64 (#552) (#553)

In https://github.com/ooni/probe/issues/1741, we observed that
every attempt to use `docker --platform` along with `debian` for
packaging ooniprobe fails with `SEGFAULT`, except when using
the `debian:oldstable` container.

To fix this issue, in this diff we fix Debian packaging to run on
any debian system (`debian:stable` in our case) provided that we
have `qemu-user-static` installed on the system and the system is
a Debian (or Debian-derived) system.

The trick here is to use `dpkg-buildpackage -a $deb_arch`. We
also need to disable a few `debian/rules` that we don't actually
need anyway.

Closes https://github.com/ooni/probe/issues/1741.

This cherry-picks 36a5bf34f99f382a081efd642dd472888a57602b
from the stable branch into the master branch.

debian/rules

@@ -14,5 +14,17 @@ override_dh_auto_build:
 override_dh_dwz:
 	true
 
+override_dh_strip:
+	# We cross compile and build packages for any arch from
+	# linux/amd64 so we need to avoid this step. BTW this step
+	# is not needed because we already strip when building.
+	true
+
+override_dh_makeshlibs:
+	# We cross compile and build packages for any arch from
+	# linux/amd64 so we need to avoid this step. BTW this step
+	# is not needed because we don't have any shlib.
+	true
+
 override_dh_auto_install:
 	dh_auto_install -- --no-source