[issue29631] Error “importlib.h, importlib_external.h updated. You will need to rebuild pythoncore to see the changes.” is reported when build Python on Winodws

[Karen]

New submission from Karen:

We use VS2015 to build Python(branch 3.6)on Windows. It failed with error "importlib.h, importlib_external.h updated. You will need to rebuild pythoncore to see the changes". This error is reported from Python 3.6 branch revision 3ab24bd. The detailed error log file is attached. Could you please help to take a look? Thank you so much!

Here is repro steps:
1. git clone -b "3.6" -c core.autocrlf=true https://github.com/python/cpython.git D:\Python3\src
2. checkout the revision to 3ab24bd.
3. build -e -r -v

----------
components: Build
files: Python3_x86_build.log
messages: 288436
nosy: Karen
priority: normal
severity: normal
status: open
title: Error “importlib.h, importlib_external.h updated. You will need to rebuild pythoncore to see the changes.” is reported when build Python on Winodws
type: compile error
versions: Python 3.6
Added file: http://bugs.python.org/file46664/Python3_x86_build.log

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29631>
_______________________________________