It seems that since c489a767af46f33e73d96a5746e46a7365814db2 the AMD64 Windows10 buildbot for Python3.6 fails to compile. Error log:

Using "C:\Program Files (x86)\MSBuild\14.0\bin\\msbuild.exe" (found in the registry)
Cannot locate MSBuild.exe on PATH or as MSBUILD variable 
Deleting .pyc/.pyo files ...
Deleting test leftovers ...
Could Not Find D:\buildarea\3.6.bolen-windows10\build\Lib\*.pyc
The system cannot find the file specified.
Could Not Find D:\buildarea\3.6.bolen-windows10\build\PCbuild\python*.zip
Using "D:\buildarea\3.6.bolen-windows10\build\PCbuild\\..\externals\pythonx86\tools\python.exe" (found in externals directory)
Fetching external libraries...
bzip2-1.0.6 already exists, skipping.
openssl-1.0.2o already exists, skipping.
sqlite-3.21.0.0 already exists, skipping.
tcl-core-8.6.6.0 already exists, skipping.
tk-8.6.6.0 already exists, skipping.
tix-8.4.3.6 already exists, skipping.
xz-5.2.2 already exists, skipping.
Fetching external binaries...
nasm-2.11.06 already exists, skipping.
Finished.
Using "C:\Program Files (x86)\MSBuild\14.0\bin\\msbuild.exe" (found in the registry)
Cannot locate MSBuild.exe on PATH or as MSBUILD variable 
program finished with exit code 2
elapsedTime=1.953000