user32: Make the clipboard tests pass on Vista.

dlls/user32/tests/clipboard.c

@@ -66,8 +66,9 @@ static void test_ClipboardOwner(void)
     ok(OpenClipboard(hWnd1), "OpenClipboard failed\n");
 
     SetLastError(0xdeadbeef);
-    ok(!OpenClipboard(hWnd2) && GetLastError() == 0xdeadbeef,
-       "OpenClipboard should fail without setting last error value\n");
+    ok(!OpenClipboard(hWnd2) &&
+       (GetLastError() == 0xdeadbeef || GetLastError() == ERROR_ACCESS_DENIED),
+       "OpenClipboard should fail without setting last error value, or with ERROR_ACCESS_DENIED, got error %d\n", GetLastError());
 
     SetLastError(0xdeadbeef);
     ok(!GetClipboardOwner() && GetLastError() == 0xdeadbeef, "clipboard should still be not owned\n");
@@ -76,8 +77,9 @@ static void test_ClipboardOwner(void)
     ok(GetClipboardOwner() == hWnd1, "clipboard should be owned by %p, not by %p\n", hWnd1, GetClipboardOwner());
 
     SetLastError(0xdeadbeef);
-    ok(!OpenClipboard(hWnd2) && GetLastError() == 0xdeadbeef,
-       "OpenClipboard should fail without setting last error value\n");
+    ok(!OpenClipboard(hWnd2) &&
+       (GetLastError() == 0xdeadbeef || GetLastError() == ERROR_ACCESS_DENIED),
+       "OpenClipboard should fail without setting last error valuei, or with ERROR_ACCESS_DENIED, got error %d\n", GetLastError());
 
     ret = CloseClipboard();
     ok( ret, "CloseClipboard error %d\n", GetLastError());