merge 3.6 (#28932)

diff --cc Misc/NEWS
index 15bc0ed6a7bced6e0b8b0d60274c0a00749dab0a,cd1b6618d3755ef78a852c2e58329b81fbb1a523..24285d56a9e427f5ecd43b93c096f7141d86e6ec
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -10,9 -10,8 +10,11 @@@ What's New in Python 3.7.0 alpha 
  Core and Builtins
  -----------------
  
 +- Issue #28927: bytes.fromhex() and bytearray.fromhex() now ignore all ASCII
 +  whitespace, not only spaces.  Patch by Robert Xiao.
 +
+ - Issue #28932: Do not include <sys/random.h> if it does not exist.
+ 
  - Issue #25677: Correct the positioning of the syntax error caret for
    indented blocks.  Based on patch by Michael Layzell.
  

diff --cc configure
Simple merge

diff --cc configure.ac
Simple merge

diff --cc pyconfig.h.in
Simple merge