util.bit support for Lua 5.4

[cmcqueen]

I've been using Lockbox for a Lua dissector in Wireshark 3.6 to 4.2, which uses Lua 5.2.

In Wireshark 4.4 which now uses Lua 5.4.6, I get an error "no bitwise support found". It looks as though Lua 5.4 removes bit32.

[gcarlos64]

I also have been using lockbox on wireshark dissectors and I have made a patch to workaround with this problem.

I have only tested it with DES + CBC, but it seems do work ok.

It's not something that should be merged, as it possibly breaks something, but you could test to see if it fits your needs.

bitwise.patch