* Resynchronise with Debian. Remaining changes: - Disable mlock() test since it fails with ulimit 0 (on buildds). - Set gpg (or gpg2) and gpgsm to use a passphrase agent by default. - Only suggest gnupg-curl and libldap; recommendations are pulled into minimal, and we don't need the keyserver utilities in a minimal Ubuntu system. - Remove the Win32 build. - Update config.guess/config.sub for aarch64. * Dropped patches: - Fix udeb build failure on powerpc, building with -O2 instead of -Os. (No longer seems to be necessary.) * Simplify removal of Win32 build, to make this easier to merge in future.