CI/Windows: Work around unset VCToolsRedistDir
environment variable
#710
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Recently, the
vcvarsall.bat
batch script from VS 2019 has stopped defining theVCToolsRedistDir
environment variable, for reasons unknown so far.We rely on that variable in CI to copy MSVC runtime DLLs to our Windows packages, so this adds a workaround for when that variable is not set.