MDEV-4021 : Enable Ctrl-C handler when reading password, on Windows.
Prior to this patch, _getch() was used to read password input from console. getch() has a property that it reads Ctrl-C as character with ASCII code 0x03, and disregards Ctrl-C handler for current process. The fix is to use ReadConsole() API instead of getch() , after setting console mode to ENABLE_PROCESSED_INPUT - this mode allows current process to handle Ctrl-C events.
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