rdnssd: Need to create run directory

Installing rdnssd works, but running fails with:

[12:05] naked.place6:~# rdnssd -f 
rdnssd[7557]: 0:                                 2a0a:e5c0:2:a::a expires at 6731
rdnssd[7557]: 0:                                 2a0a:e5c0:2:a::a expires at 6731
rdnssd[7557]: 1:                                 2a0a:e5c0:2:a::b expires at 6731
rdnssd[7557]: Cannot write /var/run/rdnssd/resolv.conf.tmp: No such file or directory
rdnssd[7557]: 0: place6.ungleich.ch expires at 6731
rdnssd[7557]: Cannot write /var/run/rdnssd/resolv.conf.tmp: No such file or directory
rdnssd[7557]: 0:                                 2a0a:e5c0:2:a::a expires at 6732
rdnssd[7557]: 1:                                 2a0a:e5c0:2:a::b expires at 6731
rdnssd[7557]: 0:                                 2a0a:e5c0:2:a::a expires at 6732
rdnssd[7557]: 1:                                 2a0a:e5c0:2:a::b expires at 6732
rdnssd[7557]: Cannot write /var/run/rdnssd/resolv.conf.tmp: No such file or directory
rdnssd[7557]: 0: place6.ungleich.ch expires at 6732
rdnssd[7557]: Cannot write /var/run/rdnssd/resolv.conf.tmp: No such file or directory
^C[12:05] naked.place6:~#

Solution: create /var/run/rdnssd/ on installation, writable by nobody

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