and add/remove a few entries

Source: https://www.blacklistmaster.com/blacklists

i.e. just a few of the alive ones as that alive list currently also
contains many dead ones

Source:
https://multirbl.valli.org/list/

i.e. just what is still alive

Source:
https://github.com/matteocorti/check_rbl/blob/0262c7104267c8555e80dea8e2d1347df0c7a485/check_rbl.ini#L1-L161

i.e. the small subset that isn't dead for many years or obviously broken

Source:
https://github.com/kuyint/rbl-check/blob/8cd9e1301385dd31f82ce7fae6e5043e020541cc/rbl_check.sh#L17C10-L71C65

cf. https://en.wikipedia.org/wiki/Comparison_of_DNS_blacklists

cf. https://datatracker.ietf.org/doc/html/rfc5782#section-5

i.e. what is still alive.

Many of the DNSBL blcheck includes are dead for several years.

Source:
https://github.com/IntellexApps/blcheck/blob/b055a8a6d6be6d4160bccaef9ace87d68e602a9d/blcheck#L44-L162

to avoid noise in mem-leak check tools

Also:

- ping.py - send ICMP requests over a RAW socket to arbitrary
  destinations
- otherhost.py - dump rtnl_link_stats64::rx_otherhost_dropped using the
  drgn programmable debugger

__name__ breaks auto-magic importlib name resolution when filename
contains a dash ...

and re-establish Copr git workaround

Apparently, Copr nowadays already checks out submodules, on its own.
Also, its build environment seems to have changed, such that we need
to install extra packages.

and actually use a simplified/more idiomatic construct