fix incorrect extension in bootscripts spec

SPECS/lfs-bootscripts.spec

@@ -8,7 +8,7 @@ Release:	1
 License:	None
 URL:		http://www.linuxfromscratch.org
 Group:		LFS/Base
-Source0:	http://www.linuxfromscratch.org/lfs/downloads/9.1/%{name}-%{version}.tar.bz2
+Source0:	http://www.linuxfromscratch.org/lfs/downloads/9.1/%{name}-%{version}.tar.xz
 Requires:	filesystem
 %description
 The lfs-bootscripts package contains a set of scripts to start/stop the LFS system