Removed some of the SECURITY_xxx types.

diff --git a/include/wtypes.h b/include/wtypes.h
index b8f7923..71c0631 100644
--- a/include/wtypes.h
+++ b/include/wtypes.h
@@ -215,11 +215,7 @@
     WORD Sbz2;
 } ACL, *PACL;
 
-typedef DWORD SECURITY_INFORMATION;
-typedef WORD SECURITY_DESCRIPTOR_CONTROL, *PSECURITY_DESCRIPTOR_CONTROL;
-typedef DWORD ACCESS_MASK, *PACCESS_MASK;
-
-typedef PVOID PGENERIC_MAPPING;
+typedef USHORT SECURITY_DESCRIPTOR_CONTROL, *PSECURITY_DESCRIPTOR_CONTROL;
 
 /* The security descriptor structure */
 typedef struct {