Force cout/ cerr to be initialised before errors in test registry are printed

- see #461

include/internal/catch_test_case_registry_impl.hpp

@@ -105,6 +105,7 @@ namespace Catch {
         std::vector<TestCase> m_functionsInOrder;
         std::vector<TestCase> m_nonHiddenFunctions;
         size_t m_unnamedCount;
+        std::ios_base::Init m_ostreamInit; // Forces cout/ cerr to be initialised
     };
 
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