Close #17828: better handling of codec errors - output type errors now redirect users to the type-neutral convenience functions in the codecs module - stateless errors that occur during encoding and decoding will now be automatically wrapped in exceptions that give the name of the codec involved

#include "Python.h"

#ifndef PLATFORM
#define PLATFORM "unknown"
#endif

const char *
Py_GetPlatform(void)
{
	return PLATFORM;
}