check-armhf-time_t: Ensure that eatmydata, killall, and ctags are installed

Benjamin Drungrequested to merge
bdrung/armhf-time_t:dependencies into main

check-armhf-time_t calls eatmydata and killall. Ensure that these binaries are present and install them if they are missing.

abi-compliance-checker warns:

WARNING: can't find 'ctags' program

Install universal-ctags to provide the recommended ctags.

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