Patch merged into serialice/master: lua: Fix build with lua 5.3

the following patch was just integrated into master:
commit 9406bc17fa54747f958103826e8b1012b66f617d
Author: Patrick Georgi 
Date:   Mon Jul 6 19:52:22 2015 +0200

lua: Fix build with lua 5.3

Lua's API changed between 5.2 and 5.3, so turn on compatibility.

Change-Id: I3f96198cbe75858120a2e874fee0e63fe03d183a
    Signed-off-by: Patrick Georgi 
    Reviewed-on: http://review.coreboot.org/10812
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/10812 for details.

-gerrit