Ship Windows binary of syslinux in the ISO filesystem

It should be the same version as the Linux one we provide in utils/linux/syslinux.
It should be stored as utils/win32/syslinux.exe, so that Universal USB Installer and TuxBoot can find and use it.

Feature Branch: feature/7425-ship-win32-syslinux

Parent Task: #7378 (closed)

Original created by @intrigeri on 7425 (Redmine)

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