buildsys: switch to automatic debug packages

automatically generated -dbgsym packages has become the default
(see dh_strip(1) and [0]).
While we have no direct need to migrate, it helps in avoiding
debhelper bug 939164 (see [1]), when migrating to debhelper-compat 12.
(alternative option would be to depend on debhelper from backports, or
to skip dh_dwz).

The change is well described in dh_strip(1).

[0] https://wiki.debian.org/AutomaticDebugPackages
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=939164
Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>

debian/control

@@ -247,25 +247,6 @@ Description: OpenZFS test infrastructure and support scripts
  testing and validating a system using OpenZFS. It is entirely optional
  and should only be installed and used in test environments.
 
-Package: zfs-dbg
-Section: contrib/debug
-Priority: optional
-Architecture: linux-any
-Depends: libnvpair3linux (= ${binary:Version}),
-         libuutil3linux (= ${binary:Version}),
-         libzfs4linux (= ${binary:Version}),
-         libzpool4linux (= ${binary:Version}),
-         zfs-zed (= ${binary:Version}),
-         zfsutils-linux (= ${binary:Version}),
-         ${misc:Depends}
-Description: Debugging symbols for OpenZFS userland libraries and tools
- OpenZFS is a storage platform that encompasses the functionality of
- traditional filesystems and volume managers. It supports data checksums,
- compression, encryption, snapshots, and more.
- .
- This package contains the debugging symbols for libzpool4linux, libzfs4linux,
- libnvpair3linux, libuutil3linux, zfs-zed and zfsutils-linux.
-
 Package: spl
 Section: contrib/metapackages
 Architecture: all

debian/rules

@@ -92,7 +92,7 @@ override_dh_makeshlibs:
 	dh_makeshlibs -a -V
 
 override_dh_strip:
-	dh_strip --dbg-package=zfs-dbg
+	dh_strip --dbgsym-migration='zfs-dbg (<< 2.0.4~)'
 
 override_dh_auto_clean:
 	find . -name .gitignore -delete