uucore: fix clippy::pedantic warnings in build.rs and generated locale code #15261

Job	Run time
Style/format (ubuntu-latest, feat_os_unix)	21s
Style/Python	8s
Pre-commit hooks	34s
Style/spelling (ubuntu-latest, feat_os_unix)	17s
Style/lint (ubuntu-latest, all, true)	2m 19s
Style/lint (macos-latest, feat_os_macos)	1m 51s
Style/toml	16s
Style/lint (windows-latest, feat_os_windows)	3m 44s
	9m 30s

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