xwayland: add -noTouchPointerEmulation

In some scenarios, the Wayland compositor might have more knowledge
than the X11 server and may be able to perform pointer emulation for
touch events better. Add a command-line switch to allow compositors
to turn Xwayland pointer emulation off.

Signed-off-by: Simon Ser <contact@emersion.fr>
5 jobs for no-touch-emulate-pointer in 7 minutes and 14 seconds (queued for 5 seconds)
Status Name Job ID Coverage
  Docker Image
passed debian-buster #13420624

00:00:28

 
  Build And Test
passed autotools #13420625

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passed meson #13420626

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passed meson-noglamor #13420627

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passed mingw-cross-build #13420628

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