handle should be pointer on Windows

[Guest0x0]

According to https://learn.microsoft.com/en-us/windows/win32/winprog/windows-data-types, the ABI of HANDLE should be void* on Windows. Currently it is UInt64, which can be problematic for 32bit tool chains.

[coveralls]

Pull Request Test Coverage Report for Build 1276

Details

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.1%) to 67.779%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/internal/fd_util/fd_util.mbt	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/internal/event_loop/thread_pool.mbt	1	40.0%
src/internal/event_loop/event_loop.mbt	3	57.33%

Totals
Change from base Build 1272:	-0.1%
Covered Lines:	1849
Relevant Lines:	2728

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💛 - Coveralls