For consistency with just about everything else, make syslinux.sleep()
count seconds, and syslinux.msleep() count milliseconds.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Add proper sleep() and msleep() functions, which among other things
call syslinux_idle(), and make Lua use them.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Merge Marcel Ritter's work on the lua branch:

The last time he wrote about the state of his lua branch:
http://syslinux.zytor.com/archives/2009-October/013383.html

The current state is:

- VESA:
  - switching to vesa mode works
  - loading/displaying images works
  - display text works (s. com32/lua/test/vesa.lua)

- PCI:
  - list PC devices + ID
  - get human-readable device name for device
   (s. com32/lua/test/pci.lua)

- DMI:
  - get DMI info (BIOS, Hardware, etc).
  (s. com32/lua/test/dmi.lua)

- syslinux:
  - loading files, kernel, initrd
  - start kernel, initrd, local boot
  ... just working on this, so no example lua file right now

Most of the actual merging work was done by Gert Hulselmans <gerth@zytor.com>.

Resolved Conflicts:
	com32/lib/sys/vesa/initvesa.c
	com32/lua/src/Makefile

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Quiet gcc warnings about unused variables and functions -- things that
are not used in the Syslinux environment at this time.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

gcc warns about suspicious-looking code with a comparison inside ==.
The code is correct, but add parens so that gcc know we know it is
correct.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Need header files for functions we invoke.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Modernize the Makefile for lua to match the current style, in
particular to have it pick up its configuration and rules from the
central MCONFIG file.

This also fixes the incorrect use of "clean" vs. "spotless" which was
picked up from the Makefile style in use at that time.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Update the lua code to work with Syslinux 4.