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1db8a85a60
Incorporate the LGPL v2.1 licensed implementation of ARC4, taken from the Nettle project (https://git.lysator.liu.se/nettle/nettle.git, commit 3e7a480a1e351884), and tweak it a bit so we don't have to operate on a skip buffer to fast forward the stream cipher, but can simply invoke it with NULL dst or src arguments to achieve the same. This removes the dependency [via libell] on the OS's implementation of ecb(arc4), which may be going away, and which is not usually accelerated in the first place.