Fix lua/bit32/bit-extract and lua/bit32/bit-replace not working on ComputerCraft
Fix lua/bit32/bit-extract and lua/bit32/bit-replace not working on ComputerCraft

ComputerCraft has an incomplete bit32 API.
bit32.lib.lua implemented ALL the functions in software, but only if bit32 didn't exist entirely, which does on CC.
This means bit32.extract and bit32.replace weren't implemented in software on CC. This commit fixes the issue.

See https://github.com/dan200/ComputerCraft/pull/298

SquidDev/urn,SquidDev/urn