2026.9.21.1: the borrowed CYGWIN is withdrawn, by measurement #2054

Job	Run time
toolchain: musl + llvm	9m 29s
integration: mcpp builds & runs xlings	9m 27s
examples: the curriculum builds	9m 27s
toolchain: gcc (cold self-host)	9m 29s
build + unit tests (linux x86_64, self-host)	9m 27s
	47m 19s

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