Fixed issue #4233. Changed semantic of _fileio.FileIO's close() method on file objects with closefd=False. The file descriptor is still kept open but the file object behaves like a closed file. The FileIO object also got a new readonly attribute closefd. Approved by Barry Backport of r67106 from the py3k branch

#include "Python.h"

#ifndef PLATFORM
#define PLATFORM "unknown"
#endif

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