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The declared C runtime is installed before the fixup consumes it; the… #1989

Job	Run time
toolchain: musl + llvm	11m 40s
examples: the curriculum builds	8m 52s
build + unit tests (linux x86_64, self-host)	18m 53s
integration: mcpp builds & runs xlings	8m 30s
toolchain: gcc (cold self-host)	11m 34s
	59m 29s