Wrong Overture building with inner rings

[bertt]

Overture building '08b1f9ed9c658fff02004a20c1814552' in Grenoble gives wrong result.

Footprint:

Result after tiling:

Geometry is valid according to st_isvalid

wkt

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[bertt]

Testcase added to #211

[bertt]

Fix:

[bertt]

fixed