Description
===========
Under heavy load, the aysnchronous Windows file IO API can return a
failure code that is handled in MySQL Server by retrying the file IO operation.

A cast necessary for the correct operation of the retry path in a 64 bit
build is missing, leading to the file IO retry result being misinterpreted
and ultimately the report of the OS error number 995
(ERROR_OPERATION_ABORTED) in the MySQL error log.

Fix
===
Supply the missing cast.
Reviewed-by: Sunny Bains <sunny.bains@oracle.com>
RB: 14109