winhttp/tests: Fix test failures on Windows XP.

dlls/winhttp/tests/winhttp.c

@@ -995,7 +995,10 @@ static void test_secure_connection(void)
     ok(req != NULL, "failed to open a request %u\n", GetLastError());
 
     ret = WinHttpSetOption(req, WINHTTP_OPTION_CLIENT_CERT_CONTEXT, WINHTTP_NO_CLIENT_CERT_CONTEXT, 0);
-    ok(!ret && GetLastError() == ERROR_WINHTTP_INCORRECT_HANDLE_STATE, "setting client cert context returned %x (%u)\n", ret, GetLastError());
+    err = GetLastError();
+    ok(!ret, "unexpected success\n");
+    ok(err == ERROR_WINHTTP_INCORRECT_HANDLE_STATE || broken(err == ERROR_INVALID_PARAMETER) /* winxp */,
+       "setting client cert context returned %u\n", err);
 
     ret = WinHttpSendRequest(req, NULL, 0, NULL, 0, 0, 0);
     err = GetLastError();
@@ -1021,7 +1024,8 @@ static void test_secure_connection(void)
     ok(req != NULL, "failed to open a request %u\n", GetLastError());
 
     ret = WinHttpSetOption(req, WINHTTP_OPTION_CLIENT_CERT_CONTEXT, WINHTTP_NO_CLIENT_CERT_CONTEXT, 0);
-    ok(ret, "failed to set client cert context %u\n", GetLastError());
+    err = GetLastError();
+    ok(ret || broken(!ret && err == ERROR_INVALID_PARAMETER) /* winxp */, "failed to set client cert context %u\n", err);
 
     WinHttpSetStatusCallback(req, cert_error, WINHTTP_CALLBACK_STATUS_SECURE_FAILURE, 0);