Log Message:
Update lua to 5.0.2, from Bruce J.A. Nourish via tech-pkg@.

Lua 5.0.2 is a bugfix release, which contains the following fixes:

src/ldo.c
        Attempt to resume running coroutine crashed Lua
src/lgc.c
        C functions also may have stacks larger than current top
        Userdata to be collected still counted into new GC threshold
src/lgc.h
        Userdata to be collected still counted into new GC threshold
src/lparser.c
        Syntax `local function' did not increment stack size
src/lvm.c
        `pc' address was invalidated when a coroutine was suspended
        Count hook might be called without being set
src/lib/lbaselib.c
        Buffer overflow for unusual %p representation
        Wrong number of returns from chunks loaded from stdin
src/lib/liolib.c
        `file.close()' could not be called without arguments
        Buffer overflow for unusual %p representation
src/luac/luac.c
        Missing lock/unlock