A polygon has no right to have holes that are actually points.
        So just skip them when we collect the result of an operation.

per-file comments:
  mysql-test/r/gis-precise.result
Fix for bug #804259 Second assertion in Gis_geometry_collection::init_from_opresult.
        test result updated.
  mysql-test/t/gis-precise.test
Fix for bug #804259 Second assertion in Gis_geometry_collection::init_from_opresult.
        test case added.
  sql/gcalc_tools.cc
Fix for bug #804259 Second assertion in Gis_geometry_collection::init_from_opresult.
        Skip the point in the result if it's the hole inside a polygon.