Fix MSVC /analyze warning about inconsistent annotations

include/internal/catch_debugger.hpp

@@ -109,7 +109,9 @@
 #endif // Platform
 
 #ifdef CATCH_PLATFORM_WINDOWS
-    extern "C" __declspec(dllimport) void __stdcall OutputDebugStringA( const char* );
+
+#include "catch_windows_h_proxy.h"
+
     namespace Catch {
         void writeToDebugConsole( std::string const& text ) {
             ::OutputDebugStringA( text.c_str() );