Build xz tarballs instead of bzip2

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

configure.ac

@@ -27,7 +27,7 @@ AC_CONFIG_SRCDIR([Makefile.am])
 AC_CONFIG_HEADERS([config.h])
 
 # Initialize Automake
-AM_INIT_AUTOMAKE([foreign dist-bzip2])
+AM_INIT_AUTOMAKE([foreign dist-xz])
 
 # Initialize libtool
 AC_PROG_LIBTOOL