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Always call pthread_attr_init() in hardware_stack_limits(), not only on FreeBSD (if pthread_attr_get_np() is available).

• Issue: Implement stack size detection on FreeBSD #159603

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Emscripten fails to build:

../../../../Python/ceval.c:162:33: error: incompatible pointer types passing 'workaround_pthread_attr_t *' to parameter of type 'pthread_attr_t *' [-Wincompatible-pointer-types]
  162 |     int err = pthread_attr_init(&attr);
      |                                 ^~~~~
/home/runner/work/_temp/emsdk-cache/6.0.10/emsdk/upstream/emscripten/cache/sysroot/include/pthread.h:149:39: note: passing argument to parameter here
  149 | int pthread_attr_init(pthread_attr_t *);
      |                                       ^

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Good: "Tests / Emscripten / build and test (pull_request)" passed with my fix.