refactor(toolchain): one producer for host-compile flags; build.mcpp … #676

Job	Run time
toolchain: musl + llvm	6m 52s
build + unit tests (linux x86_64, self-host)	8m 5s
integration: mcpp builds & runs xlings	7m 24s
toolchain: gcc (cold self-host)	6m 22s
	28m 43s

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