[Swan-commit] Changes to ref refs/heads/main

[Paul Wouters]

New commits:
commit 52c5cecda7543c4910a075a68e684469bacbbbd7
Author: Paul Wouters <paul.wouters at aiven.io>
Date:   Sun Dec 24 16:51:45 2023 -0500

    building: do not abuse USE_IPTABLES or USE_NFTABLES
    
    These defines were misused to see if we were compiling for Linux.
    
    Introduce USE_CAT and USE_NFLOG instead. Disable keywords and
    whack commands when OS does not support them.
    
    Note that leftcat/rightcat has no corresponding whack option.