security/kdbxviewer: update to 0.1.9 and unbreak with -fno-common

Summary:

• Unbreak this port by adding an extern keyword in the right place.
• Fix ANSI color setting on abort()
• Upstream has moved to a new github account (https://github.com/luelista/kdbxviewer) but appears to have abandoned the project. Move upstream to a fork which appears to have continued development on the project. Upstream does not tag releases but periodically changes the README to indicate a new release.
• Remove dead WWW and replace it with upstream repository.
• Set MAINTAINER to reporter

Differential Revision: https://reviews.freebsd.org/D32822