Bug#1103335: sgml-base: drop versioned dependency on dpkg, satisfied since Squeeze

[Luca Boccassi <bluca@debian.org>]

Package: sgml-base
Version: 1.31

Dear Maintainer(s),

sgml-base depends on dpkg (>= 1.16.4), which shipped in Debian 6.0
(Squeeze) in 2014, 11 years ago. dpkg is prio: essential, so this
dependency is no longer needed.

Dropping the explicit and unnecessary dependency eases building a
package-based minimal, read-only initrd with the maintainer scripts
being ran at image build time, as we can install packages and then
remove apt/dpkg using --root from outside without removing sgml-base,
which is pulled in by xml-core and other packages.

Given this package is in the QA group, I'll shortly upload a DELAYED/5
NMU, debdiff attached. Will push to salsa once it's in unstable.

diff -Nru sgml-base-1.31/debian/changelog sgml-base-1.31+nmu1/debian/changelog
--- sgml-base-1.31/debian/changelog	2022-10-06 19:03:38.000000000 +0100
+++ sgml-base-1.31+nmu1/debian/changelog	2025-04-16 13:38:03.000000000 +0100
@@ -1,3 +1,10 @@
+sgml-base (1.31+nmu1) unstable; urgency=medium
+
+  * Non-maintainer upload.
+  * Drop dependency satisfied since Debian 6 (Closes: #-1)
+
+ -- Luca Boccassi <bluca@debian.org>  Wed, 16 Apr 2025 13:38:03 +0100
+
 sgml-base (1.31) unstable; urgency=medium
 
   * QA upload by the Reproducible Builds team.
diff -Nru sgml-base-1.31/debian/control sgml-base-1.31+nmu1/debian/control
--- sgml-base-1.31/debian/control	2022-10-06 18:47:13.000000000 +0100
+++ sgml-base-1.31+nmu1/debian/control	2025-04-16 13:36:27.000000000 +0100
@@ -12,7 +12,6 @@
 Architecture: all
 Multi-Arch: foreign
 Depends: ${misc:Depends}
-Pre-Depends: dpkg (>= 1.16.4)
 Suggests: sgml-base-doc
 Description: SGML infrastructure and SGML catalog file support
  This package creates the SGML infrastructure directories and provides