[Sshguard-maintainers] Build fix for SSHGuard 1.6.0 using 'ipfw' and 'hosts' backends

[Kevin Z. <kev...@gm...>]

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This is an errata notice for the SSHGuard 1.6.0 release:

## Problem ##

SSHGuard supports one of several firewall backends; of these, the
'ipfw' and 'hosts' backends failed to build due to a missing header
file after some code reorganization prior to the 1.6.0 release.

There is no workaround available; however, users who are not using the
'ipfw' or 'hosts' backends are not affected.

## Solution ##

Those who are affected should apply the attached patch against the
1.6.0 release tarball, or track the 1.6 branch on Bitbucket.

## Credits ##

Thanks to Mark Felder <fe...@Fr...> for reporting this issue.

- -- 
Kevin Zheng
kev...@gm... | ke...@kd... | PGP: 0xC22E1090
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