maint: Reduce struct padding #993

Job	Run time
default-ubuntu-20.04-gcc	1m 42s
A job to run test in OpenBSD	2m 13s
default-ubuntu-20.04-clang	1m 20s
default-ubuntu-22.04-gcc	1m 48s
default-ubuntu-22.04-clang	3m 32s
default-ubuntu-24.04-gcc	3m 35s
default-ubuntu-24.04-clang	6m 7s
btrfs-clone-ubuntu-latest-	2m 28s
epochalypse-ubuntu-latest-	2m 7s
dist-test-ubuntu-latest-	2m 27s
Slackware-ubuntu-latest-	1m 9s
without-nls-ubuntu-latest-	2m 17s
without-curses-ubuntu-latest-	2m 9s
Alpine-ubuntu-latest-	19s
OpenSuse-Tumbleweed-ubuntu-latest-	29s
	33m 42s

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