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fix(runtime, build): the dlopen surface is walked, and one unwinder p… #1836

Job	Run time
build + unit tests (linux x86_64, self-host)	14m 3s
integration: mcpp builds & runs xlings	10m 11s
toolchain: musl + llvm	9m 59s
examples: the curriculum builds	9m 49s
toolchain: gcc (cold self-host)	8m 3s
	52m 5s