Switch to a seccomp whitelist #2
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All syscalls, ioctls and socket families have to be whitelisted now instead of blacklisted. This is far more restrictive than the previous blacklist.
I also had to rework the W^X restrictions as the syscall args have to be whitelisted too. We need to test these as I don't think it works properly (firefox and thunderbird work fine which shouldn't be the case).