bpo-40268: Remove unused osdefs.h includes (GH-19532)

When the include is needed, add required symbol in a comment.

Python/fileutils.c

@@ -1,6 +1,6 @@
 #include "Python.h"
 #include "pycore_fileutils.h"
-#include "osdefs.h"
+#include "osdefs.h"               // SEP
 #include <locale.h>
 
 #ifdef MS_WINDOWS

Python/import.c

@@ -16,7 +16,6 @@
 #include "marshal.h"
 #include "code.h"
 #include "frameobject.h"
-#include "osdefs.h"
 #include "importdl.h"
 #include "pydtrace.h"
 

Python/pathconfig.c

@@ -1,7 +1,7 @@
 /* Path configuration like module_search_path (sys.path) */
 
 #include "Python.h"
-#include "osdefs.h"
+#include "osdefs.h"               // DELIM
 #include "pycore_initconfig.h"
 #include "pycore_fileutils.h"
 #include "pycore_pathconfig.h"

Python/pylifecycle.c

@@ -26,7 +26,6 @@
 #include "symtable.h"
 #include "ast.h"
 #include "marshal.h"
-#include "osdefs.h"
 #include <locale.h>
 
 #ifdef HAVE_SIGNAL_H

Python/pythonrun.c

@@ -27,7 +27,6 @@
 #include "symtable.h"
 #include "ast.h"
 #include "marshal.h"
-#include "osdefs.h"
 #include <locale.h>
 
 #ifdef HAVE_SIGNAL_H

Python/sysmodule.c

@@ -26,9 +26,9 @@ Data members:
 #include "pycore_pymem.h"         // _PyMem_SetDefaultAllocator()
 #include "pycore_pystate.h"       // _PyThreadState_GET()
 #include "pycore_tupleobject.h"
-#include "pydtrace.h"
 
-#include "osdefs.h"
+#include "pydtrace.h"
+#include "osdefs.h"               // DELIM
 #include <locale.h>
 
 #ifdef MS_WINDOWS

Python/traceback.c

@@ -6,7 +6,7 @@
 #include "code.h"
 #include "frameobject.h"
 #include "structmember.h"         // PyMemberDef
-#include "osdefs.h"
+#include "osdefs.h"               // SEP
 #ifdef HAVE_FCNTL_H
 #include <fcntl.h>
 #endif