docs: the three Windows toolchain axes — a design, and two corrections #834

Job	Run time
windows→linux cross-build (windows host)	7m 47s
mingw-cross linux→windows (build + wine run)	4m 59s
cross-build aarch64-linux-musl (mcpp + xlings)	8m 38s
windows→linux artefact really runs (linux)	6s
	21m 30s

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