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This function can be used to check if a given address or network has one
of the following network flags.

* LOC_NETWORK_FLAG_ANONYMOUS_PROXY
* LOC_NETWORK_FLAG_SATELLITE_PROVIDER
* LOC_NETWORK_FLAG_ANYCAST

It will return true if the given flag is set.
Signed-off-by: Stefan Schantl <stefan.schantl@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>