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Remove haveged

Kristian Klausen requested to merge klausenbusk/archiso:remove-haveged into master 
haveged was added 8 years ago[1] to increase entropy and presumably to
prevent entropy starvation.

A few things has changed since, most notable:
* the kernel actively tries to add entropy (jitter entropy)[2][3][4][5]
* /dev/random no longer blocks after CRNG initialization[6][7]

[1] d7e790d ("Initialize pacman keyring on bootup")
[2] https://github.com/torvalds/linux/commit/3f2dc2798b81531fd93a3b9b7c39da47ec689e55
[3] https://github.com/torvalds/linux/commit/50ee7529ec4500c88f8664560770a7a1b65db72b
[4] https://lore.kernel.org/lkml/alpine.DEB.2.21.1909290010500.2636@nanos.tec.linutronix.de/T/
[5] https://lwn.net/Articles/800509/
[6] https://github.com/torvalds/linux/commit/30c08efec8884fb106b8e57094baa51bb4c44e32
[7] https://lwn.net/Articles/808575/

Fix #98

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