This cleans up the "easy" warning fixes which can be made using my

Closed Thomas E. Dickey requested to merge dickey/libxt:fix-implied-conversions into master

Regress script, comparing object-files before/after the edits:

The changes are casts, which quiet the gcc warnings about implicit conversion that my "gcc-normal" script would show. I avoided reformatting the code.

The change reduces the number of gcc warnings from 769 to 163.

Signed-off-by: Thomas E. Dickey

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