MFC r207842:
Import of liblzma, xz, xzdec, lzmainfo from vendor branch
Add support for xz and lzma to lesspipe.sh (xzless, lzless)
MFC r207844:
Add two public headers missing in r207842
Adjust CFLAGS for lzmainfo, xz, xzdec
MFC r208099:
Add versioned symbols to liblzma
Use default SHLIB_MAJOR.
Approved by: delphij (mentor)
