Avoid platform-specific code in `markdown:check-links` task #1320

Job	Run time
run-determination	1s
check-errors (./)	33s
check-errors (docsgen)	35s
check-outdated (./)	20s
check-style (./)	17s
check-outdated (docsgen)	14s
check-style (docsgen)	17s
check-outdated (ruledocsgen)	15s
check-errors (ruledocsgen)	33s
check-style (ruledocsgen)	15s
check-config (./)	23s
check-config (docsgen)	24s
check-config (ruledocsgen)	25s
check-formatting (./)	16s
check-formatting (docsgen)	20s
check-formatting (ruledocsgen)	14s
	5m 22s

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