Commits on Nov 25, 2023

1. add explicit <unistd.h> include …

   This fixes the following compilation error with Python 3.13.0a1:
   ```
   c-ext/backend_c.c:275:13: error: implicit declaration of function ‘sysconf’; did you mean ‘sscanf’? [-Werror=implicit-function-declaration]
     275 |     count = sysconf(_SC_NPROCESSORS_ONLN);
         |             ^~~~~~~
         |             sscanf
   ```
   
   According to https://docs.python.org/3.13/whatsnew/3.13.html:
   
   Python.h no longer includes the <unistd.h> standard header file.
   If needed, it should now be included explicitly.
   For example, it provides the functions: read(), write(), close(), isatty(), lseek(), getpid(), getcwd(), sysconf() and getpagesize().
   As a consequence, _POSIX_SEMAPHORES and _POSIX_THREADS macros are no longer defined by Python.h.
   The HAVE_UNISTD_H and HAVE_PTHREAD_H macros defined by Python.h can be used to decide if <unistd.h> and <pthread.h> header files can be included.
   
   See python/cpython#108783 .

   

   rathann committed Nov 25, 2023
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