Corresponding code changes

src/catch.h

@@ -0,0 +1,14 @@
+// Minetest
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+// We want to have catch write to rawstream (stderr) instead of stdout.
+// This should be included instead of <catch_amalgamated.hpp>
+// to patch the output streams accordingly.
+#define CATCH_CONFIG_NOSTDOUT
+#include <catch_amalgamated.hpp>
+
+namespace Catch {
+	std::ostream& cout();
+	std::ostream& clog();
+	std::ostream& cerr();
+}