support for the x32 architecture #6722
Original bug ID: 6722
This patch adds support for the x32 architecture, on Linux.
As you can see, most of the troubles came from the current code confusing x32 with amd64 and i386. It should also be possible to borrow pieces from those two architectures to add native support, however, not knowing anything about ocaml or the compiler, I went with bytecode only for now.