Log Message:
Update Lua to version 5.3.2 and link with pthreads to fix pkg/47587.

Lua 5.3.2 fixes all bugs listed in
        http://www.lua.org/bugs.html#5.3.1 [1]

Lua 5.3.2 also contains several internal improvements and includes a
revised reference manual:
	http://www.lua.org/manual/5.3/

[1]
    1. io.lines does not check maximum number of options.
       reported by Patrick Donnell on 10 Jul 2015. existed since 3.0.
       Example:
-- can crash in some machines
t ={}; for i = 1, 253 do t[i] = 1 end
io.lines("someexistingfile", table.unpack(t))()