Adds DHCPINFO functionality to the lua.c32 binary

 gettable() returns a table of the BOOTP message fields returned by
 the DHCP server for use in a Lua pxeboot script
 See http://tools.ietf.org/html/rfc1542

     lua key value           RFC key
 -----------------------------------------------------------------------
      opcode                  op       message opcode
      hardware.type           htype    Hardware address type
      hardware.length         hlen     Hardware address length
      hops                    hops     Used by relay agents
      transaction.id          xid      transaction id
      elapsed.seconds         secs     Secs elapsed since client boot
      flags                   flags    DHCP Flags field
      client.ip.addr          ciaddr   client IP addr
      your.ip.addr            yiaddr   'Your' IP addr. (from server)
      server.ip.addr          siaddr   Boot server IP addr
      gateway.ip.addr         giaddr   Relay agent IP addr
      client.mac              chaddr   Client hardware addr
      server.hostname         sname    Optl. boot server hostname
      boot.file               file     boot file name (ascii path)
      magic.cookie            cookie   Magic cookie

 getoptions() returns a table of the DHCP Options field of the BOOTP
 message returned by the DHCP server for use in a Lua pxeboot script.
 Many of the options are reurned formatted in as strings in a
 standard,
 recognizable format, such as IP addresses.

 1, 2, and 4 byte numerical options are returned as integers.

 Other Options with non-standard formats are returned as strings of
 the
 raw binary number that was returned by the DHCP server and must be
 decoded in a Lua script

 The Options table returns the Option code as the key except where
 there
 are multiple values returned. In those cases, an extra key increment
 number
 is added to allow individual access to each Option value.

      lua key value           value Name
 -----------------------------------------------------------------------
      1                       Subnet Mask
      6.1                     DNS Server [element 1]
      6.2                     DNS Server [element 2]
      6.3                     DNS Server [element 3]
      209                     PXE Configuration File
      21.1                    Policy Filter [element 1]
      21.2                    Policy Filter [element 2]

 Options that can have a list of values, but contain only one (like
 Option 6)
 will not return with .sub key values.

 Usage:
            t = dhcp.gettable()

            for k,v in pairs(t) do
              print(k.." : "..v)
            end

com32.mk already includes the necessary library in $(C_LIBS), we don't
need to list them again in $(LIBS).

Signed-off-by: Matt Fleming <matt.fleming@linux.intel.com>

Move the MCONFIG files into a mk/ directory and give them more
descriptive names.

This is purely a cosmetic change to make the 'include' directives a
bit more coherent by making it obvious exactly which MCONFIG file
we're including. For example, in com32/lua/src/Makefile we exchange
the line,

	include ../../MCONFIG

for the much more comprehensible,

	include $(MAKEDIR)/com32.mk

Signed-off-by: Matt Fleming <matt.fleming@linux.intel.com>

Updating base code to 5.1.4
Adding -DSYSLINUX build flag
Moving #if 0 to ifndef SYSLINUX

Simple patch to make gcc happy during build in -Wall -Werror

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>

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.