feat(freestanding): exceptions off graph-wide, and the std subset becomes usable #917

Job	Run time
mingw-cross linux→windows (build + wine run)	5m 10s
cross-build aarch64-linux-musl (mcpp + xlings)	9m 56s
windows→linux cross-build (windows host)	7m 14s
windows→linux artefact really runs (linux)	4s
	22m 24s

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