runner beyond bare metal: honour [target.<triple>].runner on hosted t… #1519

Job	Run time
toolchain: musl + llvm	7m 20s
build + unit tests (linux x86_64, self-host)	14m 10s
integration: mcpp builds & runs xlings	9m 43s
toolchain: gcc (cold self-host)	7m 43s
	38m 56s

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