feat: cxx_stdlib, the curriculum in CI, and two criteria that machine… #1686

Job	Run time
toolchain: gcc (cold self-host)	7m 54s
integration: mcpp builds & runs xlings	10m 6s
build + unit tests (linux x86_64, self-host)	16m 10s
examples: the curriculum builds	7m 39s
toolchain: musl + llvm	8m 0s
	49m 49s

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