[syslinux] Don't allow users to append additional kernel cmdline args

[Gebhardt Thomas]

Hi,

I'm successfully using PXELINUX for booting several flavors of Linux
using the LABEL/APPEND syntax in the config file. But I don't want to
allow the users to append additional kernel command line arguments
like "init=/bin/sh". Scanning the docs and the mailing list archive I
could not figure out how to do this.  Can anyone give me a hint?

Thanks, Thomas