[Bug 43893] Disable use of SHM extension through environment variable

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=43893

--- Comment #3 from Alexandre Julliard <julliard at winehq.org> ---
(In reply to Panard from comment #2)
> Sure, but in our case, this is to disable only clients in a particular
> container, not all the clients on the host.

There has to be a way to fix this at the container or Xlib level instead of
changing every single app.

> Moreover, looking at the current code in winex11.drv/bitblt.c, if the
> extension is disabled on the server, create_shm_image will still make a lot
> of work until it gets kicked off by XShmAttach because the current
> implementation of XShm still enable XShmCreateImage if the extension is
> disabled ; therefore disabling the extension on the server will lead to very
> bad performances with wine.

That's work that we do anyway if the extension is available, so the performance
will be pretty much unchanged.

The real performance loss will be transferring the bits instead of using shm,
but an environment variable won't make any difference there.

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