Check for Windows instead of WIN32 for wmain entry point
Closes #1849
diff --git a/include/internal/catch_default_main.hpp b/include/internal/catch_default_main.hpp
index 17ad090..aab5cba 100644
--- a/include/internal/catch_default_main.hpp
+++ b/include/internal/catch_default_main.hpp
@@ -9,10 +9,11 @@
#define TWOBLUECUBES_CATCH_DEFAULT_MAIN_HPP_INCLUDED
#include "catch_session.h"
+#include "catch_platform.h"
#ifndef __OBJC__
-#if defined(CATCH_CONFIG_WCHAR) && defined(WIN32) && defined(_UNICODE) && !defined(DO_NOT_USE_WMAIN)
+#if defined(CATCH_CONFIG_WCHAR) && defined(CATCH_PLATFORM_WINDOWS) && defined(_UNICODE) && !defined(DO_NOT_USE_WMAIN)
// Standard C/C++ Win32 Unicode wmain entry point
extern "C" int wmain (int argc, wchar_t * argv[], wchar_t * []) {
#else
