debian/xz-utils: Remove old NEWS.Debian

This contains advice from 2010 about upgrading from a very early
version of the package.  It should not be relevant for new
installations or for people upgrading from more recent versions, so
remove the old news and avoid some clutter.
diff --git a/debian/changelog b/debian/changelog
index 91cfc57..14aeec3 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -22,6 +22,7 @@
   * xz-utils:
     - Lower priority of xz-utils to standard.  Closes: #685203.
     - README.Debian: Remove notes about differences from upstream.
+    - Remove old NEWS.Debian.
 
  -- Jonathan Nieder <jrnieder@gmail.com>  Sun, 27 Jan 2019 15:02:13 -0800
 
diff --git a/debian/xz-utils.NEWS b/debian/xz-utils.NEWS
deleted file mode 100644
index 6eac958..0000000
--- a/debian/xz-utils.NEWS
+++ /dev/null
@@ -1,31 +0,0 @@
-xz-utils (4.999.9beta+20100212-2) unstable; urgency=low
-
-  The tiny xzdec and lzmadec decompressors have been moved to the new
-  xzdec package.  One can use xzcat (which is an abbreviation for
-  “xz --decompress --stdout”) to replace them where space is not a
-  premium.
-
- -- Jonathan Nieder <jrnieder@gmail.com>  Tue, 23 Feb 2010 08:24:10 -0600
-
-xz-utils (4.999.9beta+20100117-1) unstable; urgency=low
-
-  From this version on, xz produces sparse files by default when
-  decompressing.  This saves disk space when reproducing files with long
-  runs of zero bytes, such as file system images.  Implementing this
-  feature requires seeking forward beyond the end of a file so that the
-  operating system knows where to put in a hole.
-
-  If you use xz --decompress to write to end of a file that is appended
-  to at the same time by another process, this could cause concurrent
-  output from the other command to be overwritten.  This is a rare and
-  quite weird thing to do.  If you really want to do it, note that xz’s
-  buffering strategy is not part of its documented interface; to safely
-  interleave concurrent output from xz and another command, a
-  construction such as
-
-  	xz --decompress input.xz | dd ibs=1k obs=1k >> log
-
-  would be needed to avoid unpredictable results.
-
- -- Jonathan Nieder <jrnieder@gmail.com>  Tue, 02 Feb 2010 15:51:37 -0600
-