[Tile-serving] [openstreetmap/osm2pgsql] tagtransform-c.cpp warning (#789)

[Paul Norman]

The code in question is
```cpp
int flags;
for (const auto &poly_tag : poly_tags) {
    if (check_key(infos, poly_tag.key.c_str(), &filter, &flags,
                  false)) {
        // ...
    }
}

if (!(flags & FLAG_POLYGON)) {
    // ...
}
```

I *think* this is safe. The entire thing is in the old-style MP code, which we plan on removing, so I'm inclined to leave it until then.

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