fix(runtime, build): the dlopen surface is walked, and one unwinder p… #1596

Job	Run time
windows→linux cross-build (windows host)	10m 51s
cross-build aarch64-linux-musl (mcpp + xlings)	12m 39s
mingw-cross linux→windows (build + wine run)	7m 45s
windows→linux artefact really runs (linux)	6s
	31m 21s

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