Add unpacktool to CMake, port to *nix

unpacktool/unpacktool.cpp

@@ -1,4 +1,17 @@
 #include <stdio.h>
+#include <string.h>
+
+#include <string>
+#include <vector>
+
+#ifdef _WIN32
+#include <Windows.h>
+#include <shellapi.h>
+
+#include "WindowsUnicodeToolShim.h"
+#else
+#include "UnixCompat.h"
+#endif
 
 #include "IArchiveParser.h"
 #include "IFileReader.h"
@@ -22,18 +35,8 @@
 #include "CompactProLZHRLEDecompressor.h"
 
 #include "CSInputBuffer.h"
-#include "WindowsUnicodeToolShim.h"
-
 #include "CombinedTimestamp.h"
 
-#include <string.h>
-
-#include <Windows.h>
-#include <shellapi.h>
-
-#include <string>
-#include <vector>
-
 class CFileReader final : public IFileReader
 {
 public: