[syslinux] Upgrade to Lua 5.2.2, add filesystem module and get_key binding

[Ferenc Wagner]

Ferenc Wagner <wferi at niif.hu> writes:

> Hmm, yes.  The series is available at https://github.com/wferi/syslinux
> as well (lua52 branch, based on upstream firmware branch).
> Cover letter: https://gist.github.com/wferi/6989458#file-lua52_cover-txt

To get an idea what it's all about, have a look at the attached menu.lua
file.  If invoked by a config file consisting of:

DEFAULT lua.c32 menu.lua

it displays a menu based on the vmlinuz (and initrd.img) files found in
the current (root) directory:

SYSLINUX 6.02 6.02-21-gea6becb Copyright (C) 1994-2013 H. Peter Anvin et al

=== Boot menu ===
1	vmlinuz-3.10-3-amd64
2	vmlinuz-3.9-1-amd64
3	vmlinuz-3.2.0-4-amd64

Booting option 1 in 5 s with append:
root=/dev/mapper/cedar-root ro console=ttyS0
Press 1-3 to select kernel, ESC to exit, any other key to cancel timeout

It would be fairly easy to bind and use libmenu.c32 instead, but I
usually prefer to not trash my biggish terminal window containing
possibly valuable serial console output from the shutdown phase.

Just hoping to motivate review/merging... :)
-- 
Thanks,
Feri.

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