[webkit-dev] WinCairo EWS bot broken?

e.g. https://webkit-queues.webkit.org/results/9390719 Processing C:\Program Files (x86)\Windows Kits\10\include\10.0.15063.0\um\unknwn.idl midl : command line error MIDL1016 : cannot create intermediate file C:\Users\ContainerAdministrator\AppData\Local\Temp\MID8103.tmp [3047/6194] Generating ../../DerivedSources/WebKitLegacy/Interfaces/AccessibleStates.h Microsoft (R) 32b/64b MIDL Compiler Version 8.01.0622 - R. Niwa