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Meson: input thread is unconditionally disabled

If one builds xorg-server 1.20.4 with Meson (as e.g. Arch Linux does), the input thread and therefore silken mouse ends up being disabled due to the following issues:

  1. Meson sets HAVE_INPUTTHREAD, while the rest of the code uses the INPUTTHREAD macro.
  2. Detection of HAVE_PTHREAD_SETNAME_NP_WITH_TID is missing (fixed in master by c20e7b5e).
  3. Detection whether to build with -pthread and link to -lpthreads is missing.
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