linker: allow multi-step link recipe (`c.combine`) (#2954) #5704

Job	Run time
run-determination	2s
check-outdated (./)	19s
check-style (./)	1m 11s
check-formatting (./)	20s
check-config (./)	10s
check-license-headers (./)	22s
build (rpc/internal/client_example)	42s
build (internal/arduino/discovery/discovery_client)	12s
build (commands/term_example)	28s
	3m 46s

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