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ICU4C: Cache the Cygwin Setup/Installer on the CI build bots to prevent flaky builds

Description

The AppVeyor CI builds are randomly failing due to the Cygwin setup.exe failing to download, likely due to throttling by the Cygwin site.

We should see if we can cache the setup installer exe file with the AppVeyor cache mechanism, as the setup.exe doesn't rev that often and we don't really need to download it every single time a build is created.

Environment

Status

Assignee

Jeff Genovy

Reporter

Jeff Genovy

Components

Fix versions

Priority

major