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Compile and install the cmxs

See merge request !3

This reduces the differences between why3server of Adacore (which is known
to be working on Windows) and why3server of Why3.

Recovered src/driver/prove_client.ml whose version from Adacore is not
suitable on Why3 side.

The windows version of why3server (and client) now also handles a path
as socket name. However, on windows sockets are not paths, so it just
throws away the path part of the socket name, and just uses the
basename.

Change-Id: I11d5c0f1023cb21eb105a892f12065d918b9eb9c
(cherry picked from commit 924dbfe1f52c9197939d763fb72df9b980efd511)

Change-Id: Ic12eaeb437151a71a168b0f14f7a8db3343c5cb9
(cherry picked from commit 6c45b3cf5a559c064d136631a6d297f52d267afe)

Unix sockets have the restriction that the path to the socket must be
quite short (100 chars give or take depending on exact OS). We can
workaround this limitation by chdir'ing to the dirname of the socket
first. We need to do that in the client and server parts of the code,
but only for Unix (windows doesn't use Unix sockets obviously).

Right now this code is not strictly needed in gnatprove, because we
don't pass a path, only a filename as the socket. But this will change
later.

* prove_client.ml
(client_connect): save curdir, change to dirname, connect to basename,
  then go back to curdir
* options.c
rename socketname because it would clash with basename from libgen.h
* server-unix.c
rename of basename to socketname
(server_init_listening): save curdir, change to dirname, connect to
  basename, then go back to curdir
* server-win.c
rename of basename to socketname

Change-Id: Ib69587dfa136f6ced753c983bc37203c37acb936
(cherry picked from commit e6c15eb26d6077e814ab8c72deb92fc86e43600a)

Change-Id: I0c71ac7e08df20f8135fe0cacc3716b2d1024991
(cherry picked from commit 4651501b2826c6976875e6280337d640c2f787b9)

(cherry picked from commit 963190dc)

(cherry picked from commit 28cd7354)

On windows, when the why3server has accepted a client on the server
socket, it continues to use that socket for the client communication. A
new socket is created so that new clients can connect. However, there
may be a little time between accepting the client and creating the new
socket, where the connection of another client will be refused. This
resulted in crashes.

We now simply prepare more than one server socket, so that several
clients can connect at the same time. More precisely, we create as many
sockets as gnatwhy3 processes will be run in parallel.

Concretely, we replace the previous server_socket and server_key
variables by arrays, whose length is determined by the "parallel"
option. The code which manipulated these variables needs to be adapted
to know which of the sockets to manipulate.

* server-win.c
(shutdown_with_msg): close all handles
(create_server_socket): new integer argument which specifies the cell to
   store the new server socket in
(accept_client): new integer argument which specifies on which of the
   server sockets the connection was accepted. Used to create a new
   socket in that cell using create_server_socket.
(init): create an array of sockets instead of just one
(get_server_num): new function to determine the socket which got the
  new client
(main): use get_server_num to know if it was a server socket that had an
   event, and which one. Call accept_client with the result.

Change-Id: I5f7ff1b30c9340d897b75085ade61b2d79f87167
(cherry picked from commit f2cbded5da7a3fcbebb61ee98b8e6c8d9c1d2227)

Change-Id: Ie756bd146b822782bac977326a6a2b996d075dec
(cherry picked from commit 6339d6678c3260b6e4e42f944581c4515c2ed567)

loadpath is now reset to default when using why3config --detect

This commit also marks the dependency on ocamlfind as being build-only.

Some people dump the content of tarballs into git repositories and thus
experience compilation failures. Indeed, some directories from the tarball
are empty and thus not preserved by git. So this commit creates these
directories on the fly.

As for plugins/printer, it has to be handled differently, since it is
needed by ocamldep and thus cannot be created on the fly. So its .keepme
file is put in the tarball to keep it nonempty.