MinGW-w64 CI

Add `Thread::LinkedList#each` to safely iterate lists #473

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Run time

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Job	Run time
x86_64-mingw-w64-cross-compile	9m 26s
x86_64-mingw-w64-link	1m 2s
x86_64-mingw-w64-test	29m 42s
	40m 10s