If the length of wszApplicationName exceeds 1024, it will cause an error
when writing to the subsequent stack space after exceeding the wcmd space,
Wcmd needs to be modified to dynamic allocation.
Signed-off-by: Jiajin Cui <cuijiajin@uniontech.com>

4.18+ Linux kernels remove support for IPX but keep SOL_IPX defined, which
causes compilation errors as wine unconditionally uses IPX structures if
this is the case. Instead check for IPX_MTU to determine IPX support as it is
defined within the ipx.h header itself.

And do some mandatory cleanup while at it.

And give a good clean up to the test and all its helpers.

Otherwise it fails for me on 32-bit Linux with my current compiler.

This shouldn't really make a difference, but does make the code a bit conceptually simpler.

Allocating and freeing fences in particular can be expensive, as much as 250 µs
per call (observed on an NVidia machine).

Over the last few Wine releases we greatly reduced the need for the
application thread to wait for replies from the CS thread. Compared to
the time when the command stream was initially introduced, it's now
quite likely that, when the command queues become empty, they are
going to stay like that for a while (e.g. the game is throttling the
framerate or is busy doing some CPU work on its part before generating
more commands).

As a first step, reduce the spin count to reduce the busy waiting in
wined3d_cs_run(). In my tests this significantly reduces CPU usage,
with minimally decreased performance in a few rare cases but also
significantly improved performance in many cases (notably with
integrated GPUs where freeing the CPU directly allows more power to be
allocated to the GPU).