A set of new options has been add to allow the syslinux vesa menu
support to be added. Those are the new options:
- LH_SYSLINUX_CFG: set custom syslinux configuration file
- LH_SYSLINUX_MENU: set syslinux menu
- LH_SYSLINUX_MENU_LIVE_ENTRY: set text to be used on the menu for
live entries
- LH_SYSLINUX_MENU_LIVE_FAILSAFE_ENTRY: set text to be used on the
menu for live entries (failsafe ones)
- LH_SYSLINUX_MENU_MEMTEST_ENTRY: set text to be used on the menu
for memtest entry
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