Feat: support the install of pigeon using TARGET_RUNTIME_DLLS

Pascal Palendarequested to merge
support/skp-runtime into develop

In ITAGeometricalAcoustics!20 (merged) the pigeon executable gets packaged as a wheel. For this, the CMake generator expression TARGET_RUNTIME_DLLS is used. For the SketchUp API the IMPORTED_LOCATION was not set correctly. This change overrides the IMPORTED_LOCATION with the correct value.

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