Equality comparison of integers always false

[Peter Colberg]

The following test case fails with Lua 5.2 and lua-ffi abc638c on Linux x86_64.

local ffi = require("ffi")
assert((ffi.new("int", 42) > 42) == false)
assert((ffi.new("int", 42) >= 42) == true)
assert((ffi.new("int", 42) <= 42) == true)
assert((ffi.new("int", 42) < 42) == false)
assert((ffi.new("int", 42) == 42) == true) --> assertion failed!