Ensure spdx_location is not dropped when loading ports. #846

Job	Run time
format	3m 18s
builds / build (windows-2022, windows-ci)	20m 32s
builds / build (ubuntu-20.04, linux-ci)	15m 33s
builds / build (macos-12, macos-ci)	10m 7s
	49m 30s

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