Added ImpersonateLoggedOnUser stub.
diff --git a/include/winbase.h b/include/winbase.h
index 559a377..73620ce 100644
--- a/include/winbase.h
+++ b/include/winbase.h
@@ -1303,6 +1303,7 @@
BOOL WINAPI IsTextUnicode(CONST LPVOID lpBuffer, int cb, LPINT lpi);
BOOL WINAPI IsValidSecurityDescriptor(PSECURITY_DESCRIPTOR);
BOOL WINAPI IsValidSid(PSID);
+BOOL WINAPI ImpersonateLoggedOnUser(HANDLE);
BOOL WINAPI ImpersonateSelf(SECURITY_IMPERSONATION_LEVEL);
BOOL WINAPI IsProcessorFeaturePresent(DWORD);
BOOL WINAPI LookupAccountSidA(LPCSTR,PSID,LPSTR,LPDWORD,LPSTR,LPDWORD,PSID_NAME_USE);