Update XZ Utils to 5.0.3.

Information about this release from README.chromium:

Name: XZ Utils
URL: http://tukaani.org/xz/
Source URL: git://ctrl.tukaani.org/xz.git
Version: 5.0.3 (git tag v5.0.3, e32cb264ea72a4459810f30abad70dae5a4fa17d,
         2011-05-21 16:59:22 +0300)
License: Public domain/license grant, LGPL 2.1, GPL 2, GPL 3

XZ Utils is general-purpose data compression software implementing the
modified Lempel-Ziv-Markov chain algorithm (LZMA2).

Local Modifications:
 - None.

Review URL: http://codereview.chromium.org/7109015

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/xz@87706 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
120 files changed