Fix #36365: scandir duplicates file name at every 65535th file

Since DIR_W32.offset is declared as `uint16_t`, we have an overflow for
directories with many entries. This patch changes

Fix #36365: scandir duplicates file name at every 65535th file

Since DIR_W32.offset is declared as `uint16_t`, we have an overflow for
directories with many entries. This patch changes the field to
`uint32_t`.

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