xz: updated to 5.2.4

5.2.4:

* liblzma:
    - Allow 0 as memory usage limit instead of returning
      LZMA_PROG_ERROR. Now 0 is treated as if 1 byte was specified,
      which effectively is the same as 0.

    - Use "noexcept" keyword instead of "throw()" in the public
      headers when a C++11 (or newer standard) compiler is used.

    - Added a portability fix for recent Intel C Compilers.

    - Microsoft Visual Studio build files have been moved under
      windows/vs2013 and windows/vs2017.

* xz:
    - Fix "xz --list --robot missing_or_bad_file.xz" which would
      try to print an unitialized string and thus produce garbage
      output. Since the exit status is non-zero, most uses of such
      a command won't try to interpret the garbage output.

    - "xz --list foo.xz" could print "Internal error (bug)" in a
      corner case where a specific memory usage limit had been set.

(adam)