* Never clean files in quilt status directory
* debian/rules: Use $(MAKE) for recursive make
* debian/rules: Change override_dh_auto_test rule to actually run tests
* Apply security fixes from 2.0.9 (Closes: #989505):
- malloc: Set errno on failure
- malloc: Fail if requested size > PTRDIFF_MAX (CVE-2021-31873)
- calloc: Fail if multiplication overflows (CVE-2021-31870)
- cpio: Fix possible integer overflow on 32-bit systems (CVE-2021-31872)
- cpio: Fix possible crash on 64-bit systems (CVE-2021-31871)