Log Message:
Changes 5.0.3:
* liblzma fixes:
  - A memory leak was fixed.
  - lzma_stream_buffer_encode() no longer creates an empty .xz
    Block if encoding an empty buffer. Such an empty Block with
    LZMA2 data would trigger a bug in 5.0.1 and older (see the
    first bullet point in 5.0.2 notes). When releasing 5.0.2,
    I thought that no encoder creates this kind of files but
    I was wrong.
  - Validate function arguments better in a few functions. Most
    importantly, specifying an unsupported integrity check to
    lzma_stream_buffer_encode() no longer creates a corrupt .xz
    file. Probably no application tries to do that, so this
    shouldn't be a big problem in practice.
  - Document that lzma_block_buffer_encode(),
    lzma_easy_buffer_encode(), lzma_stream_encoder(), and
    lzma_stream_buffer_encode() may return LZMA_UNSUPPORTED_CHECK.
  - The return values of the _memusage() functions are now
    documented better.
* Fix command name detection in xzgrep. xzegrep and xzfgrep now
  correctly use egrep and fgrep instead of grep.
* French translation was added.