Build xz tarballs instead of bzip2

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

configure.ac

@@ -5,7 +5,7 @@ AC_INIT([xcb-util-renderutil],[0.3.9],
 AC_CONFIG_SRCDIR([Makefile.am])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([m4])
-AM_INIT_AUTOMAKE([foreign dist-bzip2])
+AM_INIT_AUTOMAKE([foreign dist-xz])
 AM_MAINTAINER_MODE
 
 XCB_UTIL_COMMON([1.4], [1.6])