feat(xlings): provision `[xlings] deps` on first build, at global sco… #1229

Job	Run time
windows→linux cross-build (windows host)	10m 20s
cross-build aarch64-linux-musl (mcpp + xlings)	9m 16s
mingw-cross linux→windows (build + wine run)	5m 27s
windows→linux artefact really runs (linux)	5s
	25m 8s

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