build: Switch source compression to xz

configure.ac

@@ -10,7 +10,7 @@ AC_CONFIG_AUX_DIR([build-aux])
 
 AC_USE_SYSTEM_EXTENSIONS
 
-AM_INIT_AUTOMAKE([1.8 foreign nostdinc])
+AM_INIT_AUTOMAKE([1.8 foreign nostdinc no-dist-gzip dist-xz])
 
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])],
                             [AC_SUBST([AM_DEFAULT_VERBOSITY], [1])])

debian/changelog

@@ -29,6 +29,7 @@ dpkg (1.16.5) UNRELEASED; urgency=low
   * Document in deb-src-control(5) the “Private-” field prefix.
   * Add new start-stop-daemon --no-close option to disable closing file
     descriptors on --background. Closes: #627333, #64642
+  * Switch source compression to xz.
 
   [ Updated dpkg translations ]
   * Swedish (Peter Krefting).

debian/source/options

@@ -1,2 +1,2 @@
-# Use bzip2 compression by default, we save 2.5Mb
-compression = "bzip2"
+# Use xz compression by default, we save 4.6 MiB
+compression = "xz"