FIX: C++ std::tuple constexpr initial list on old compiler

test/unit/utglTF2ImportExport.cpp

@@ -753,12 +753,21 @@ TEST_F(utglTF2ImportExport, wrongTypes) {
     // Deliberately broken version of the BoxTextured.gltf asset.
     using tup_T = std::tuple<std::string, std::string, std::string, std::string>;
     std::vector<tup_T> wrongTypes = {
+#ifdef __cpp_lib_constexpr_tuple
         { "/glTF2/wrongTypes/badArray.gltf", "array", "primitives", "meshes[0]" },
         { "/glTF2/wrongTypes/badString.gltf", "string", "name", "scenes[0]" },
         { "/glTF2/wrongTypes/badUint.gltf", "uint", "index", "materials[0]" },
         { "/glTF2/wrongTypes/badNumber.gltf", "number", "scale", "materials[0]" },
         { "/glTF2/wrongTypes/badObject.gltf", "object", "pbrMetallicRoughness", "materials[0]" },
         { "/glTF2/wrongTypes/badExtension.gltf", "object", "KHR_texture_transform", "materials[0]" }
+#else
+        tup_T( "/glTF2/wrongTypes/badArray.gltf", "array", "primitives", "meshes[0]" ),
+        tup_T( "/glTF2/wrongTypes/badString.gltf", "string", "name", "scenes[0]" ),
+        tup_T( "/glTF2/wrongTypes/badUint.gltf", "uint", "index", "materials[0]" ),
+        tup_T( "/glTF2/wrongTypes/badNumber.gltf", "number", "scale", "materials[0]" ),
+        tup_T( "/glTF2/wrongTypes/badObject.gltf", "object", "pbrMetallicRoughness", "materials[0]" ),
+        tup_T( "/glTF2/wrongTypes/badExtension.gltf", "object", "KHR_texture_transform", "materials[0]" )
+#endif
     };
     for (const auto& tuple : wrongTypes)
     {