Issue #15819: Merge include search from 3.5 into 3.6

diff --cc Doc/library/stdtypes.rst
Simple merge

diff --cc Makefile.pre.in
Simple merge

diff --cc Misc/NEWS
index 5f2ded472405958268557612baf5e3e755c82daa,246ac72e9f9e933c22a70be7b6b823f67579b67a..34c3748ee4f5b14ab1337119f6e1fd847b60e3ae
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -2,22 -2,10 +2,28 @@@
  Python News
  +++++++++++
  
 -What's New in Python 3.5.3 release candidate 1?
 -===============================================
 +What's New in Python 3.6.0 beta 2
 +=================================
 +
 +*Release date: XXXX-XX-XX*
 +
 +Core and Builtins
 +-----------------
 +
 +Library
 +-------
 +
++Build
++-----
++
++- Issue #15819: Remove redundant include search directory option for building
++  outside the source tree.
++
  
 -Release date: TBA
 +What's New in Python 3.6.0 beta 1
 +=================================
 +
 +*Release date: 2016-09-12*
  
  Core and Builtins
  -----------------