gh-106320: Remove private _PyLong converter functions

Move private functions to the internal C API (pycore_traceback.h):

Argument Clinic now emits #include "pycore_long.h" when using these
functions.

Author: vstinner

Include/cpython/longobject.h

@@ -2,10 +2,6 @@
 #  error "this header file must not be included directly"
 #endif
 
-PyAPI_FUNC(int) _PyLong_UnsignedShort_Converter(PyObject *, void *);
-PyAPI_FUNC(int) _PyLong_UnsignedInt_Converter(PyObject *, void *);
-PyAPI_FUNC(int) _PyLong_UnsignedLong_Converter(PyObject *, void *);
-PyAPI_FUNC(int) _PyLong_UnsignedLongLong_Converter(PyObject *, void *);
 PyAPI_FUNC(int) _PyLong_Size_t_Converter(PyObject *, void *);
 
 PyAPI_FUNC(PyObject*) PyLong_FromUnicodeObject(PyObject *u, int base);

Include/internal/pycore_long.h

@@ -186,6 +186,13 @@ extern char* _PyLong_FormatBytesWriter(
     int base,
     int alternate);
 
+// Argument converters used by Argument Clinic
+PyAPI_FUNC(int) _PyLong_UnsignedShort_Converter(PyObject *, void *);
+PyAPI_FUNC(int) _PyLong_UnsignedInt_Converter(PyObject *, void *);
+PyAPI_FUNC(int) _PyLong_UnsignedLong_Converter(PyObject *, void *);
+PyAPI_FUNC(int) _PyLong_UnsignedLongLong_Converter(PyObject *, void *);
+
+
 /* Long value tag bits:
  * 0-1: Sign bits value = (1-sign), ie. negative=2, positive=0, zero=1.
  * 2: Reserved for immortality bit

Modules/_blake2/clinic/blake2b_impl.c.h

@@ -3613,6 +3613,8 @@ def converter_init(self, *, bitwise: bool = False) -> None:
             self.format_unit = 'H'
         else:
             self.converter = '_PyLong_UnsignedShort_Converter'
+            self.add_include('pycore_long.h',
+                             '_PyLong_UnsignedShort_Converter()')
 
     def parse_arg(self, argname: str, displayname: str) -> str | None:
         if self.format_unit == 'H':
@@ -3674,6 +3676,8 @@ def converter_init(self, *, bitwise: bool = False) -> None:
             self.format_unit = 'I'
         else:
             self.converter = '_PyLong_UnsignedInt_Converter'
+            self.add_include('pycore_long.h',
+                             '_PyLong_UnsignedInt_Converter()')
 
     def parse_arg(self, argname: str, displayname: str) -> str | None:
         if self.format_unit == 'I':
@@ -3711,6 +3715,8 @@ def converter_init(self, *, bitwise: bool = False) -> None:
             self.format_unit = 'k'
         else:
             self.converter = '_PyLong_UnsignedLong_Converter'
+            self.add_include('pycore_long.h',
+                             '_PyLong_UnsignedLong_Converter()')
 
     def parse_arg(self, argname: str, displayname: str) -> str | None:
         if self.format_unit == 'k':
@@ -3750,6 +3756,8 @@ def converter_init(self, *, bitwise: bool = False) -> None:
             self.format_unit = 'K'
         else:
             self.converter = '_PyLong_UnsignedLongLong_Converter'
+            self.add_include('pycore_long.h',
+                             '_PyLong_UnsignedLongLong_Converter()')
 
     def parse_arg(self, argname: str, displayname: str) -> str | None:
         if self.format_unit == 'K':