Merge branch 'master' of http://git.tukaani.org/xz

Sync with upstream.

* 'master' of http://git.tukaani.org/xz: (22 commits)
  Update THANKS.
  Docs: Cleanup line wrapping a bit.
  Fix a few typos and add some missing articles in some documents.
  Windows: Update notes about static linking with MSVC.
  liblzma: Remove outdated comments.
  DOS: Link against DJGPP's libemu to support FPU emulation.
  liblzma: Fix Libs.private in liblzma.pc to include -lrt when needed.
  Docs: Update MINIX 3 information in INSTALL.
  Update THANKS.
  Fix exit status of xzgrep when grepping binary files.
  Update THANKS.
  Fix compiling with IBM XL C on AIX.
  Tests: Fix a compiler warning with _FORTIFY_SOURCE.
  Docs: Explain the stable releases better in README.
  xz: Show minimum required XZ Utils version in xz -lvv.
  xz: Fix a typo in a comment.
  Update THANKS.
  xz: Fix xz on EBCDIC systems.
  Update THANKS.
  liblzma: Fix invalid free() in the threaded encoder.
  ...

Conflicts:
	src/liblzma/common/outqueue.c
	src/liblzma/common/stream_encoder_mt.c