MinGW-w64 CI

Fix the return type of `Enumerable#sum/product` for union elements #508

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Run time

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Job	Run time
x86_64-mingw-w64-cross-compile	9m 6s
x86_64-mingw-w64-link	1m 22s
x86_64-mingw-w64-test	30m 46s
	41m 14s