Directly pass NULL rather than an empty string.

Don't pass "()" format to PyObject_CallXXX() to call a function without
argument: pass NULL as the format string instead. It avoids to have to parse a
string to produce 0 argument.

Issue #27960: Revert state to 675e20c38fdac6, backing out all changes by developed for Issue #12885.

When building it breaks, we won't be fixing it.

[merge from 3.5] - Update pkgutil docs to reference appropriate finder and loader object documentation.

Initial patch contributed by Jaysinh shukla.

Initial patch contributed by Jaysinh shukla.

It is unused. It also forces a 16-byte alignment, which creates problems because
Python's allocator only uses 8-byte alignment.

Apparently the test succeeds on XP.

Other changes:

* Rewrite _Py_normalize_encoding() as a C implementation of
  encodings.normalize_encoding(). For example, " utf-8 " is now normalized to
  "utf_8". So the fast path is now used for more name variants of the same
  encoding.
* Avoid strcpy() when encoding is NULL: call directly the UTF-8 codec

This test should always raise RuntimeError.

and Windows CE is no longer a relevant platform for Python.