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gh-108765: Include explicitly <unistd.h> in signalmodule.c (#111402)

unistd.h is needed by alarm() and pause() functions.

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Original file line number	Diff line number	Diff line change
`@@ -1120,7 +1120,8 @@ Porting to Python 3.13`
`1120`	`1120`	* ``Python.h`` no longer includes the ``<unistd.h>`` standard header file. If
`1121`	`1121`	`needed, it should now be included explicitly. For example, it provides the`
`1122`	`1122`	functions: ``read()``, ``write()``, ``close()``, ``isatty()``, ``lseek()``,
`1123`		- ``getpid()``, ``getcwd()``, ``sysconf()`` and ``getpagesize()``.
	`1123`	+ ``getpid()``, ``getcwd()``, ``sysconf()``, ``getpagesize()``, ``alarm()`` and
	`1124`	+ ``pause()``.
`1124`	`1125`	As a consequence, ``_POSIX_SEMAPHORES`` and ``_POSIX_THREADS`` macros are no
`1125`	`1126`	longer defined by ``Python.h``. The ``HAVE_UNISTD_H`` and ``HAVE_PTHREAD_H``
`1126`	`1127`	macros defined by ``Python.h`` can be used to decide if ``<unistd.h>`` and

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Original file line number	Diff line number	Diff line change
`@@ -21,6 +21,9 @@`
`21`	`21`	`# include"socketmodule.h"// SOCKET_T`
`22`	`22`	`#endif`
`23`	`23`
	`24`	`+#ifdefHAVE_UNISTD_H`
	`25`	`+# include<unistd.h>// alarm()`
	`26`	`+#endif`
`24`	`27`	`#ifdefMS_WINDOWS`
`25`	`28`	`# ifdefHAVE_PROCESS_H`
`26`	`29`	`# include<process.h>`

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