add explicit <unistd.h> include #209
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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 .
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This fixes the following compilation error with Python 3.13.0a1:
According to https://docs.python.org/3.13/whatsnew/3.13.html:
Python.hno 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()andgetpagesize(). As a consequence,_POSIX_SEMAPHORESand_POSIX_THREADSmacros are no longer defined byPython.h. TheHAVE_UNISTD_HandHAVE_PTHREAD_Hmacros defined byPython.hcan be used to decide if<unistd.h>and<pthread.h>header files can be included.See python/cpython#108783 .