gitlab-ci: add a Windows 32-bit CI.
Some issues may happen only for 32-bit builds. So it may be worth make a Windows 32-bit build too. Issue #2794 triggered this reasonning, though in this issue's case, simply the build would not have discovered the bug since it was only a build warning + run-time bug. Still long-term if we manage to get a no-warning build, it could become relevant to discover more errors at build time. So preparing the ground work here.
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