[syslinux] Dell problems with PXELINUX 3.62

[Miller, Shao]

Good day Daniel,

As mentioned, the COMBOOT and COMBOOT32 modules should be matched with
your version of Syslinux (PXELINUX).  MEMDISK is a Linux kernel format
binary, and is not tied to the Syslinux version used, since it doesn't
depend on Syslinux.  MEMDISK can be booted by other boot-loaders, for
instance.

I have access to plenty of Dell Optiplex GX280s...  None of whom
experience trouble with recent Syslinux versions.  You might consider
the option of using a newer Syslinux version, if testing does not yield
a regression for your other models.

- Shao Miller