[mkgmap-dev] Commit: r1595: Avoid infinite loops when following roundabout arcs.

Version 1595 was commited by markb on 2010-03-05 12:29:18 +0000 (Fri, 05 Mar 2010) Avoid infinite loops when following roundabout arcs. The code worked OK for well formed roundabouts but could hang when the roundabout had a "tail". Now, it should not hang no matter how weird the roundabout is.