[gobject-introspection] configure.ac: Generate xz tarball with ustar format by default

[Javier JardÃn <jjardon src gnome org>]

commit 042158186bbfda3c9b15669ec6b5f5a1e373127a
Author: Javier JardÃn <jjardon gnome org>
Date:   Fri Aug 26 12:15:40 2011 +0100

    configure.ac: Generate xz tarball with ustar format by default

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index d6c1b39..9959f7c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,10 +17,10 @@ AC_CONFIG_HEADER([config.h])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_AUX_DIR([build-aux])
 
-AM_INIT_AUTOMAKE([1.7 tar-ustar dist-bzip2 no-dist-gzip foreign -Wno-portability])
+AM_INIT_AUTOMAKE([1.11 tar-ustar dist-xz no-dist-gzip foreign -Wno-portability])
 AM_MAINTAINER_MODE([enable])
 
-m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])],)
+AM_SILENT_RULES([yes])
 
 # Check for Win32
 AC_CANONICAL_HOST