Log Message:
Changes 5.0.2:
* LZMA2 decompressor now correctly accepts LZMA2 streams with no
  uncompressed data. Previously it considered them corrupt. The
  bug can affect applications that use raw LZMA2 streams. It is
  very unlikely to affect .xz files because no compressor creates
  .xz files with empty LZMA2 streams. (Empty .xz files are a
  different thing than empty LZMA2 streams.)
* "xz --suffix=.foo filename.foo" now refuses to compress the
  file due to it already having the suffix .foo. It was already
  documented on the man page, but the code lacked the test.
* "xzgrep -l foo bar.xz" works now.
* Polish translation was added.