patch 8.2.3481: failures when char is unsigned Commit: https://github.com/vim/vim/commit/2e258bd79f403bcccb1336bea70803957a83808f Author: James McCoy <jamessan@jamessan.com> Date: Tue Oct 5 19:44:04 2021 +0100 patch 8.2.3481: failures when char is unsigned Problem: Failures when char is unsigned. Solution: Use int8_T. Make a CI run with unsigned char. (James McCoy, closes #8936)

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|f|o@1| |7| @64
|f|o@1| |8| @64
|f|o@1| |9| @64
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