Merge with 3.5.

Lib/site-packages/README

+This directory exists so that 3rd party packages can be installed
+here.  Read the source for site.py for more details.

Tools/buildbot/build-amd64.bat

+@rem Formerly used by the buildbot "compile" step.
+@echo This script is no longer used and may be removed in the future.
+@echo To get the same effect as this script, use
+@echo     PCbuild\build.bat -d -e -k -p x64
+call "%~dp0build.bat" -p x64 %*

Tools/buildbot/clean-amd64.bat

+@rem Formerly used by the buildbot "clean" step.
+@echo This script is no longer used and may be removed in the future.
+@echo To get the same effect as this script, use `clean.bat` from this
+@echo directory and pass `-p x64` as two arguments.
+call "%~dp0clean.bat" -p x64 %*

Tools/buildbot/external-amd64.bat

+@echo This script is no longer used and may be removed in the future.
+@echo Please use PCbuild\get_externals.bat instead.
+@"%~dp0..\..\PCbuild\get_externals.bat" %*

Tools/buildbot/external.bat

+@echo This script is no longer used and may be removed in the future.
+@echo Please use PCbuild\get_externals.bat instead.
+@"%~dp0..\..\PCbuild\get_externals.bat" %*

Tools/buildbot/test-amd64.bat

+@rem Formerly used by the buildbot "test" step.
+@echo This script is no longer used and may be removed in the future.
+@echo To get the same effect as this script, use
+@echo     PCbuild\rt.bat -q -d -x64 -uall -rwW
+@echo or use `test.bat` in this directory and pass `-x64` as an argument.
+call "%~dp0test.bat" -x64 %*