[intl4x] Re-enable Windows

[goderbauer]

Fixes #987

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PR Health

Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
intl4x	Breaking	0.12.2	0.13.0-wip	0.13.0	✔️

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Package	Changed Files

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Coverage ⚠️

File	Coverage
pkgs/intl4x/hook/link.dart	💔 Not covered
pkgs/intl4x/tool/write_option_file.dart	💔 Not covered

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API leaks ⚠️

The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

Package	Leaked API symbols
intl4x	CaseMappingImpl PluralRulesImpl NumberFormatImpl CollationImpl ListFormatImpl DateTimeFormatImpl DisplayNamesImpl

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