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Arjen
d059ef1434
Two legs, both about the assumption the presence probe rests on. OpenWrt — the platform dynamic interface binding exists for — is musl, and musl reimplements getifaddrs independently of glibc. `interface_present` reads ifa_flags out of it, and the interfaces this feature exists for (fips-mesh0, fips-ap0) are unbridged with no IP address at all, which is exactly where getifaddrs implementations differ. Every other leg is glibc, so without this one the probe was asserted on a libc no test had ever run it against, on the target it was written for. Building for the musl target rather than inside an Alpine container keeps the leg to a cross-build plus a run, without a second toolchain image to maintain. The address-less interface is created on both this leg and the glibc one. Pinning the contract on both libcs is what turns "glibc and musl agree about getifaddrs" from an assumption into a checked fact, and makes the glibc leg fail first if glibc is the one that changes. Loopback cannot stand in: it has 127.0.0.1, so probing it asks whether getifaddrs works rather than whether it reports this. Deliberately not tolerant of failure — a guard that quietly does not run is worse than no guard. Adds the iface-binding suite to the integration matrix, mirroring testing/ci-local.sh.