Fix division by zero in lw_dist2d_arc_arc #151
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There was an issue with concentric arcs in the function throwing division by zero errors and "lw_dist2d_arc_arc can't handle cojoint circles, uh oh".
This PR solves it by adding a helper function to handle that special case.
Trac issue: https://trac.osgeo.org/postgis/ticket/3879