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Brad King authored
`isspace` takes `int` but documents that the value must be representable by `unsigned char`, or be EOF. Use a wrapper to cast to `unsigned char` to avoid sign extension while converting to `int`. This generalizes the fix from commit 5e8c176e (cmExecuteProcessCommand: Cast c to unsigned char before cast to int, 2024-01-05) to other `isspace` call sites. This was detected by assertions in the MSVC standard library while processing UTF-8 text. Issue: #25561
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