fix for handling of wchars on windows in getting the directory name -- updated with suggestions

Author: Brett Schiff

src/util/file_util.cpp

@@ -61,13 +61,19 @@ std::string get_current_working_directory()
   std::string working_directory=wd;
   free(wd);
   #else
-  char buffer[4096];
+  TCHAR buffer[4096];
   DWORD retval=GetCurrentDirectory(4096, buffer);
   if(retval == 0)
     throw system_exceptiont("failed to get current directory of process");
+
+  #ifdef UNICODE
+  std::string working_directory(narrow(buffer));
+  #else
   std::string working_directory(buffer);
   #endif
 
+  #endif
+
   return working_directory;
 }