Add an unpatched version of xz, XZ Utils, to /trunk/deps/third_party

xz/src/liblzma/common/easy_decoder_memusage.c

+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       easy_decoder_memusage.c
+/// \brief      Decoder memory usage calculation to match easy encoder presets
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "easy_preset.h"
+
+
+extern LZMA_API(uint64_t)
+lzma_easy_decoder_memusage(uint32_t preset)
+{
+        lzma_options_easy opt_easy;
+        if (lzma_easy_preset(&opt_easy, preset))
+                return UINT32_MAX;
+
+        return lzma_raw_decoder_memusage(opt_easy.filters);
+}