Log Message:
dpkg: updated to 1.22.15

dpkg (1.22.15) unstable; urgency=medium

* Perl modules:
  - Dpkg::BuildDriver::DebianRules: Remove unused Dpkg::BuildAPI import.
  - Dpkg::OpenPGP::Backend::GnuPG: Sign file with fixed up newline.
  - Dpkg::Substvars: Add new set_as_optional() and set_as_required() methods.
* Documentation:
  - man: Change verb tense for Makefile fragment files descriptions.
  - man: Document that buildapi.mk sets a variable.
  - man: Add reference to buildtools and vendor make fragments to related
    tools.
  - man: Split architecture examples into their own paragraphs.
  - man: Clarify architecture terms and the architecture forms.
  - man: Clarify that build and target are not usual variables to use.
  - doc: Remove duplicate words across newlines.
* Build system:
  - Add array bounds warning.
  - Add new dialect checks for strict flex array behavior and warnings.
  - Add compiler hardening support.

* Localization:
  - Update German programs translation.