Brad King aa5711490f set: Explicitly unset empty environment variables on Windows ...

KWSys's SystemTools::PutEnv implementation, on Windows, has long
interpreted `A=` as unset.  This differs from the behavior on other
platforms.  Code the distinction explicitly in `set(ENV{VAR})`.

Issue: #27285

2025-10-07 11:33:03 -04:00

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