repackage upstream tarball as bz2 instead of xz as SLE doesn't have xz

OBS-URL: https://build.opensuse.org/package/show/utilities/dateutils?expand=0&rev=2

dateutils-0.1.5.tar.bz2

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f5d38db7ff8ef08f7db5166b3aa575178887f28fbecfe4fce27f6b1854d11d65
+size 238524

dateutils-0.1.5.tar.xz

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:81a20c446bf75dff81232b4567396cf29a2192ad0bc5c736b6417f0d0e360ca5
-size 205460

dateutils.spec

@@ -4,12 +4,12 @@ Name:               dateutils
 Version:            0.1.5
 Release:            0
 Summary:            Command-line Tools for fiddling with Dates and Times
-Source:             https://github.com/downloads/hroptatyr/dateutils/dateutils-%{version}.tar.xz
+# https://github.com/downloads/hroptatyr/dateutils/dateutils-%{version}.tar.xz
+Source:             dateutils-%{version}.tar.bz2
 URL:                http://hroptatyr.github.com/dateutils/
 Group:              Productivity/Text/Utilities
 License:            BSD3c
 BuildRoot:          %{_tmppath}/build-%{name}-%{version}
-BuildRequires:      xz
 BuildRequires:      gcc make glibc-devel pkgconfig
 BuildRequires:      autoconf automake libtool
 Requires(post):     info