Gbp-Dch: ignore

Now, instead of ruby-foo depends: ruby, we will have ruby-foo depends:
libruby, and ruby depends: libruby. This requires libruby to be
architecture dependent, and marked as Multi-Arch: same.

It used to be the case that a architecture dependent Ruby C extension
package would get dependencies on ruby. For example, ruby-json has now
this:

Depends: ruby (>= 1:3.0~0), libc6 (>= 2.14), libruby3.0 (>= 3.0.0~preview2), ruby (<< 1:3.1~)

That dependency on ruby will make it impossible to install a foreign
ruby-json, because it would pull the foreign ruby, which will conflict
with the native one, and you usually can't run a foreign interpreter
anyway. With this change, that dependency field will become this:

Depends: ruby (>= 1:3.0~0), libc6 (>= 2.14), libruby3.0 (>= 3.0.0~preview2), libruby (<< 1:3.1~)

This will enable installing architecture dependent packages as foreign
packages for cross building, while still allowing obsolete packages to
be removed when ruby (and libruby) are upgraded and/or preventing ruby
from being upgraded while those obsolete packages are still around.

Gbp-Dch: full
Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=889470

ruby3.0 is still the default but to ease the transition (avoid any
entanglement with other transitions) we are re-adding ruby2.7 and it
will be removed as the next and final stage of the transition.

Gbp-Dch: full

The crossbuild directory is
/usr/lib/$(DEB_HOST_MULTIARCH)/ruby-crossbuild/$(RUBY_VERSION). It
contains a symlink to the rbconfig.rb file corresponding to the host
architecture. It should be added to the Ruby LOAD path in the calls that
generate Makefiles for cross building (e.g. `ruby extconf.rb`)

Gbp-Dch: full

Enable ruby3.0 as an alternative interpreter again :)

ruby3.0 3.0.2-1 builds failed on several architectures, and this makes
it impossible to resolve build dependencies for any ruby package on
of those architectures.

Gbp-Dch: full

This reverts commit eca67bee.

* ruby: Drop versioned constraint on apt-listbugs, rbenv and ruby-debian in Breaks.

Changes-By: deb-scrub-obsolete

[ci skip] ruby is uninstallable before ruby-rubygems is actually in the
archive.

Fixes: lintian: uses-debhelper-compat-file
See-also: https://lintian.debian.org/tags/uses-debhelper-compat-file.html

Fixes: lintian: debian-changelog-line-too-long
See-also: https://lintian.debian.org/tags/debian-changelog-line-too-long.html

Fixes: lintian: file-contains-trailing-whitespace
See-also: https://lintian.debian.org/tags/file-contains-trailing-whitespace.html