RtlSetCurrentDirectory_U: store a handle to the current directory
along with its name.

diff --git a/include/winternl.h b/include/winternl.h
index e526678..19e497d 100644
--- a/include/winternl.h
+++ b/include/winternl.h
@@ -106,8 +106,7 @@
     HANDLE              hStdInput;
     HANDLE              hStdOutput;
     HANDLE              hStdError;
-    UNICODE_STRING      CurrentDirectoryName;
-    HANDLE              CurrentDirectoryHandle;
+    CURDIR              CurrentDirectory;
     UNICODE_STRING      DllPath;
     UNICODE_STRING      ImagePathName;
     UNICODE_STRING      CommandLine;