First (uncontroversial) part of issue 9807. * Expose the build flags to Python as sys.abiflags * Shared library libpythonX.Y<abiflags>.so * python-config --abiflags * Make two distutils tests that failed with --enable-shared (even before this patch) succeed. * Fix a few small style issues.

#include "Python.h"

#ifndef PLATFORM
#define PLATFORM "unknown"
#endif

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