Distribute archive in xz instead of bz2

Fixes https://gitlab.freedesktop.org/fontconfig/fontconfig/issues/151
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a82cec4..a8e7dcf 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -27,7 +27,7 @@
     name: fontconfig-$CI_COMMIT_SHA-$CI_JOB_ID
     when: always
     paths:
-      - build-*/fontconfig-*.tar.bz2
+      - build-*/fontconfig-*.tar.*
       - build-*/fontconfig*/_build/sub/*.log
       - build-*/fontconfig*/_build/sub/test/*.log
       - build-*/fontconfig*/_build/sub/test/*.trs
diff --git a/configure.ac b/configure.ac
index ff5f2c9..9574715 100644
--- a/configure.ac
+++ b/configure.ac
@@ -34,7 +34,7 @@
 dnl Yes, it is a pain to synchronize version numbers.  Unfortunately, it's
 dnl not possible to extract the version number here from fontconfig.h
 AC_INIT([fontconfig], [2.13.1], [https://gitlab.freedesktop.org/fontconfig/fontconfig/issues/new])
-AM_INIT_AUTOMAKE([1.11 parallel-tests dist-bzip2])
+AM_INIT_AUTOMAKE([1.11 parallel-tests dist-xz])
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
 
 dnl ==========================================================================