build,win: support building MSI with VS2019
Explicitly pass the WiX SDK directory when building the MSI. WiX doesn't (yet?) have a directory for VS2019, so use the one for VS2017 which should be compatible.
cc @nodejs/platform-windows
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines