build: meson: fix setting iptables/dnsmasq/dnssec-trigger paths
Handle the iptables, dnsmasq and dnssec-trigger paths in the same way through common code. The path set by user must be accepted as is, even if does not exist, because this is a requirement for cross-compilation. When user does not specify a path, search a predefined set of paths and fall back to an hardcoded one.
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