bpo-36763: _Py_InitializeFromArgs() argc becomes Py_ssize_t (GH-13396)

* The type of initlization function 'argc' parameters becomes
  Py_ssize_t, instead of int.
* Change _PyPreConfig_Copy() return type to void, instead of int.
  The function cannot fail anymore.
* Fix compilation warnings on Windows.
diff --git a/Include/cpython/pylifecycle.h b/Include/cpython/pylifecycle.h
index a3ab6c9..8fc809d 100644
--- a/Include/cpython/pylifecycle.h
+++ b/Include/cpython/pylifecycle.h
@@ -18,11 +18,11 @@
     const _PyPreConfig *src_config);
 PyAPI_FUNC(_PyInitError) _Py_PreInitializeFromArgs(
     const _PyPreConfig *src_config,
-    int argc,
+    Py_ssize_t argc,
     char **argv);
 PyAPI_FUNC(_PyInitError) _Py_PreInitializeFromWideArgs(
     const _PyPreConfig *src_config,
-    int argc,
+    Py_ssize_t argc,
     wchar_t **argv);
 
 PyAPI_FUNC(int) _Py_IsCoreInitialized(void);
@@ -34,11 +34,11 @@
     const _PyCoreConfig *config);
 PyAPI_FUNC(_PyInitError) _Py_InitializeFromArgs(
     const _PyCoreConfig *config,
-    int argc,
+    Py_ssize_t argc,
     char **argv);
 PyAPI_FUNC(_PyInitError) _Py_InitializeFromWideArgs(
     const _PyCoreConfig *config,
-    int argc,
+    Py_ssize_t argc,
     wchar_t **argv);
 PyAPI_FUNC(_PyInitError) _Py_InitializeMain(void);
 
diff --git a/Include/internal/pycore_coreconfig.h b/Include/internal/pycore_coreconfig.h
index 80aec21..ea4418f 100644
--- a/Include/internal/pycore_coreconfig.h
+++ b/Include/internal/pycore_coreconfig.h
@@ -61,7 +61,7 @@
 /* --- _PyArgv ---------------------------------------------------- */
 
 typedef struct {
-    int argc;
+    Py_ssize_t argc;
     int use_bytes_argv;
     char **bytes_argv;
     wchar_t **wchar_argv;
@@ -123,7 +123,7 @@
 PyAPI_FUNC(void) _PyPreConfig_Init(_PyPreConfig *config);
 PyAPI_FUNC(void) _PyPreConfig_InitPythonConfig(_PyPreConfig *config);
 PyAPI_FUNC(void) _PyPreConfig_InitIsolatedConfig(_PyPreConfig *config);
-PyAPI_FUNC(int) _PyPreConfig_Copy(_PyPreConfig *config,
+PyAPI_FUNC(void) _PyPreConfig_Copy(_PyPreConfig *config,
     const _PyPreConfig *config2);
 PyAPI_FUNC(PyObject*) _PyPreConfig_AsDict(const _PyPreConfig *config);
 PyAPI_FUNC(void) _PyPreConfig_GetCoreConfig(_PyPreConfig *config,
@@ -158,10 +158,10 @@
     const _PyArgv *args);
 PyAPI_FUNC(_PyInitError) _PyCoreConfig_SetArgv(
     _PyCoreConfig *config,
-    int argc,
+    Py_ssize_t argc,
     char **argv);
 PyAPI_FUNC(_PyInitError) _PyCoreConfig_SetWideArgv(_PyCoreConfig *config,
-    int argc,
+    Py_ssize_t argc,
     wchar_t **argv);