lzma missing files arg_parser.* added

Seems the lzma (/third_party/lzma.js/) modul is missing the "arg_parser.h"
and "arg_parser.cc" files.
Added the files from:
   http://fossies.org/linux/misc/lzip-1.15-pre1.tar.gz
Merge https://github.com/BioKom/emscripten