gh-110014: Include explicitly <unistd.h> header (#110155)

* Remove unused <locale.h> includes.
* Remove unused <fcntl.h> include in traceback.h.
* Remove redundant <assert.h> and <stddef.h> includes. They  are already
  included by "Python.h".
* Remove <object.h> include in faulthandler.c. Python.h already includes it.
* Add missing <stdbool.h> in pycore_pythread.h if HAVE_PTHREAD_STUBS
  is defined.
* Fix also warnings in pthread_stubs.h: don't redefine macros if they
  are already defined, like the __NEED_pthread_t macro.

Python/bltinmodule.c

@@ -17,6 +17,11 @@
 
 #include "clinic/bltinmodule.c.h"
 
+#ifdef HAVE_UNISTD_H
+#  include <unistd.h>             // isatty()
+#endif
+
+
 static PyObject*
 update_bases(PyObject *bases, PyObject *const *args, Py_ssize_t nargs)
 {

Python/bootstrap_hash.c

@@ -4,22 +4,28 @@
 #include "pycore_pylifecycle.h"   // _PyOS_URandomNonblock()
 #include "pycore_runtime.h"       // _PyRuntime
 
+#undef HAVE_GETRANDOM
+#undef HAVE_GETENTROPY
+
+#ifdef HAVE_UNISTD_H
+#  include <unistd.h>             // close()
+#endif
 #ifdef MS_WINDOWS
 #  include <windows.h>
 #  include <bcrypt.h>
 #else
-#  include <fcntl.h>
+#  include <fcntl.h>              // O_RDONLY
 #  ifdef HAVE_SYS_STAT_H
 #    include <sys/stat.h>
 #  endif
 #  ifdef HAVE_LINUX_RANDOM_H
-#    include <linux/random.h>
+#    include <linux/random.h>     // GRND_NONBLOCK
 #  endif
 #  if defined(HAVE_SYS_RANDOM_H) && (defined(HAVE_GETRANDOM) || defined(HAVE_GETENTROPY))
-#    include <sys/random.h>
+#    include <sys/random.h>       // getrandom()
 #  endif
 #  if !defined(HAVE_GETRANDOM) && defined(HAVE_GETRANDOM_SYSCALL)
-#    include <sys/syscall.h>
+#    include <sys/syscall.h>      // SYS_getrandom
 #  endif
 #endif
 

Python/fileutils.c

@@ -2,8 +2,11 @@
 #include "pycore_fileutils.h"     // fileutils definitions
 #include "pycore_runtime.h"       // _PyRuntime
 #include "osdefs.h"               // SEP
-#include <locale.h>
+
 #include <stdlib.h>               // mbstowcs()
+#ifdef HAVE_UNISTD_H
+#  include <unistd.h>             // getcwd()
+#endif
 
 #ifdef MS_WINDOWS
 #  include <malloc.h>
@@ -19,7 +22,7 @@ extern int winerror_to_errno(int);
 #endif
 
 #ifdef HAVE_LANGINFO_H
-#include <langinfo.h>
+#  include <langinfo.h>           // nl_langinfo(CODESET)
 #endif
 
 #ifdef HAVE_SYS_IOCTL_H
@@ -27,12 +30,12 @@ extern int winerror_to_errno(int);
 #endif
 
 #ifdef HAVE_NON_UNICODE_WCHAR_T_REPRESENTATION
-#include <iconv.h>
+#  include <iconv.h>              // iconv_open()
 #endif
 
 #ifdef HAVE_FCNTL_H
-#include <fcntl.h>
-#endif /* HAVE_FCNTL_H */
+#  include <fcntl.h>              // fcntl(F_GETFD)
+#endif
 
 #ifdef O_CLOEXEC
 /* Does open() support the O_CLOEXEC flag? Possible values:

Python/frozenmain.c

@@ -3,7 +3,11 @@
 #include "Python.h"
 #include "pycore_pystate.h"       // _Py_GetConfig()
 #include "pycore_runtime.h"       // _PyRuntime_Initialize()
-#include <locale.h>
+
+#ifdef HAVE_UNISTD_H
+#  include <unistd.h>             // isatty()
+#endif
+
 
 #ifdef MS_WINDOWS
 extern void PyWinFreeze_ExeInit(void);

Python/pylifecycle.c

@@ -37,6 +37,9 @@
 
 #include <locale.h>               // setlocale()
 #include <stdlib.h>               // getenv()
+#ifdef HAVE_UNISTD_H
+#  include <unistd.h>             // isatty()
+#endif
 
 #if defined(__APPLE__)
 #  include <mach-o/loader.h>

Python/sysmodule.c

@@ -40,7 +40,9 @@ Data members:
 #include "osdefs.h"               // DELIM
 #include "stdlib_module_names.h"  // _Py_stdlib_module_names
 
-#include <locale.h>
+#ifdef HAVE_UNISTD_H
+#  include <unistd.h>             // getpid()
+#endif
 
 #ifdef MS_WINDOWS
 #  define WIN32_LEAN_AND_MEAN

Python/traceback.c

@@ -20,13 +20,14 @@
 #include "frameobject.h"          // PyFrame_New()
 
 #include "osdefs.h"               // SEP
-#ifdef HAVE_FCNTL_H
-#  include <fcntl.h>
+#ifdef HAVE_UNISTD_H
+#  include <unistd.h>             // lseek()
 #endif
 
-#define OFF(x) offsetof(PyTracebackObject, x)
 
+#define OFF(x) offsetof(PyTracebackObject, x)
 #define PUTS(fd, str) (void)_Py_write_noraise(fd, str, (int)strlen(str))
+
 #define MAX_STRING_LENGTH 500
 #define MAX_FRAME_DEPTH 100
 #define MAX_NTHREADS 100