fix: a dependency's [feature-xlings] tools must be installed before i… #1695

Job	Run time
integration: mcpp builds & runs xlings	9m 10s
toolchain: gcc (cold self-host)	9m 50s
toolchain: musl + llvm	10m 44s
examples: the curriculum builds	6m 0s
build + unit tests (linux x86_64, self-host)	15m 25s
	51m 9s

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