ci: one pinned-mcpp bootstrap, not six drifting copies #569

Job	Run time
integration: mcpp builds & runs xlings	7m 24s
toolchain: gcc (cold self-host)	5m 55s
toolchain: musl + llvm	4m 1s
build + unit tests (linux x86_64, self-host)	6m 40s
	24m 0s

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