linker: allow multi-step link recipe (`c.combine`) #5620

Job	Run time
run-determination	3s
check-style (./)	50s
check-outdated (./)	14s
check-formatting (./)	11s
check-license-headers (./)	22s
build (rpc/internal/client_example)	28s
build (internal/arduino/discovery/discovery_client)	18s
build (commands/term_example)	26s
check-config (./)	10s
	3m 2s

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