Enable two checks for comparing a complex to a complex subtype instance. Split a string comparison test in two halves, replacing "a==b==a" with separate tests for a==b and b==a. (Reason: while experimenting, this test failed, and I wanted to know if it was the first or the second == operator that failed.)

#include "Python.h"

#ifndef PLATFORM
#define PLATFORM "unknown"
#endif

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