dd: optimize O_DIRECT buffer alignment to reduce syscall overhead #2868

Job	Run time
L10n/Clap Error Localization Test	45s
L10n/French Integration Test	1m 4s
L10n/Locale Embedding - Ls Utility	56s
L10n/Locale Embedding - Cat Utility	51s
L10n/Embedded Locale Regression Test	1m 16s
L10n/Build and Test (windows-latest, feat_os_windows)	5m 13s
L10n/Fluent Syntax Check	18s
L10n/Multi-call Binary Install Test (ubuntu-latest, feat_os_unix)	6m 14s
L10n/Build and Test (ubuntu-latest, feat_os_unix)	2m 22s
L10n/Multi-call Binary Install Test (macos-latest, feat_os_macos)	9m 53s
L10n/Build and Test (macos-latest, feat_os_macos)	3m 38s
L10n/Installation Test (Make & Cargo) (ubuntu-latest, feat_os_unix)	7m 31s
L10n/Locale Support Verification	11m 12s
L10n/Installation Test (Make & Cargo) (macos-latest, feat_os_macos)	6m 56s
L10n/Locale Embedding - Multicall Binary	2m 17s
L10n/Locale Embedding Regression Test	4s
	1h 0m 30s

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