elf: include data sections without references in CollectionSpec #1385

Job	Run time
Build Documentation	38s
Build and Lint	2m 19s
Run tests on previous stable Go	2m 20s
Run tests (mainline)	1m 8s
Run tests on arm64	48s
Run tests (stable)	1m 8s
Run tests (6.6)	1m 5s
Run tests (6.1)	1m 22s
Run tests (5.15)	1m 16s
Run tests (5.10)	1m 12s
Run tests (5.4)	1m 14s
Run tests (4.19)	1m 39s
Run tests (4.14)	1m 16s
Run tests (4.9)	1m 3s
	18m 28s

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