Merge 3.4.3 release engineering changes back into 3.4.

diff --cc Misc/NEWS
index b3f24fbdfac169cf5d52f03f4ff76b77adf83e4e,826eab109d565c74cb1e6d3ff5ecb0d63069fbc9..3fcb8362913c9cf58ec342e395525099e86a407c
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -13,11 -13,49 +13,49 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #6639: Module-level turtle functions no longer raise TclError after
+   closing the window.
+ 
+ - Issues #814253, #9179: Warnings now are raised when group references and
+   conditional group references are used in lookbehind assertions in regular
+   expressions.
+ 
+ - Issue #23215: Multibyte codecs with custom error handlers that ignores errors
+   consumed too much memory and raised SystemError or MemoryError.
+   Original patch by Aleksi Torhamo.
+ 
+ - Issue #5700: io.FileIO() called flush() after closing the file.
+   flush() was not called in close() if closefd=False.
+ 
+ - Issue #23374: Fixed pydoc failure with non-ASCII files when stdout encoding
+   differs from file system encoding (e.g. on Mac OS).
+ 
+ - Issue #23481: Remove RC4 from the SSL module's default cipher list.
+ 
+ - Issue #21548: Fix pydoc.synopsis() and pydoc.apropos() on modules with empty
+   docstrings.
+ 
+ - Issue #22885: Fixed arbitrary code execution vulnerability in the dbm.dumb
+   module.  Original patch by Claudiu Popa.
+ 
+ - Issue #23146: Fix mishandling of absolute Windows paths with forward
+   slashes in pathlib.
+ 
+ - Issue #23421: Fixed compression in tarfile CLI.  Patch by wdv4758h.
+ 
+ - Issue #23361: Fix possible overflow in Windows subprocess creation code.
+ 
+ Build
+ -----
+ 
+ - Issue #23445: pydebug builds now use "gcc -Og" where possible, to make
+   the resulting executable faster.
+ 
  
 -What's New in Python 3.4.3rc1?
 -==============================
 +What's New in Python 3.4.3?
 +===========================
  
 -Release date: 2015-02-08
 +Release date: 2015-02-23
  
  Core and Builtins
  -----------------