Bug#853719: zorp: ftbfs with GCC-7

[Szilárd Pfeiffer]

Issue solved in version 6.0.10-2.

GitHub issue:
https://github.com/Balasys/zorp/issues/10

Source code of the release 6.0.10-2:
https://github.com/Balasys/zorp/releases/tag/v6.0.10-2