Remove deprecated function call

(cherry picked from commit 8dfe408)

Author: filmor

src/runtime/Converter.cs

@@ -1068,10 +1068,8 @@ internal static bool ToPrimitive(BorrowedReference value, Type obType, out objec
                         {
                             if (Runtime.PyUnicode_GetLength(value) == 1)
                             {
-                                IntPtr unicodePtr = Runtime.PyUnicode_AsUnicode(value);
-                                Char[] buff = new Char[1];
-                                Marshal.Copy(unicodePtr, buff, 0, 1);
-                                result = buff[0];
+                                int chr = Runtime.PyUnicode_ReadChar(value, 0);
+                                result = (Char)chr;
                                 return true;
                             }
                             goto type_error;

src/runtime/Runtime.Delegates.cs

@@ -175,8 +175,8 @@ static Delegates()
             PyUnicode_AsUTF8 = (delegate* unmanaged[Cdecl]<BorrowedReference, IntPtr>)GetFunctionByName(nameof(PyUnicode_AsUTF8), GetUnmanagedDll(_PythonDll));
             PyUnicode_DecodeUTF16 = (delegate* unmanaged[Cdecl]<IntPtr, nint, IntPtr, IntPtr, NewReference>)GetFunctionByName(nameof(PyUnicode_DecodeUTF16), GetUnmanagedDll(_PythonDll));
             PyUnicode_GetLength = (delegate* unmanaged[Cdecl]<BorrowedReference, nint>)GetFunctionByName(nameof(PyUnicode_GetLength), GetUnmanagedDll(_PythonDll));
-            PyUnicode_AsUnicode = (delegate* unmanaged[Cdecl]<BorrowedReference, IntPtr>)GetFunctionByName(nameof(PyUnicode_AsUnicode), GetUnmanagedDll(_PythonDll));
             PyUnicode_AsUTF16String = (delegate* unmanaged[Cdecl]<BorrowedReference, NewReference>)GetFunctionByName(nameof(PyUnicode_AsUTF16String), GetUnmanagedDll(_PythonDll));
+            PyUnicode_ReadChar = (delegate* unmanaged[Cdecl]<BorrowedReference, nint, int>)GetFunctionByName(nameof(PyUnicode_ReadChar), GetUnmanagedDll(_PythonDll));
             PyUnicode_FromOrdinal = (delegate* unmanaged[Cdecl]<int, NewReference>)GetFunctionByName(nameof(PyUnicode_FromOrdinal), GetUnmanagedDll(_PythonDll));
             PyUnicode_InternFromString = (delegate* unmanaged[Cdecl]<StrPtr, NewReference>)GetFunctionByName(nameof(PyUnicode_InternFromString), GetUnmanagedDll(_PythonDll));
             PyUnicode_Compare = (delegate* unmanaged[Cdecl]<BorrowedReference, BorrowedReference, int>)GetFunctionByName(nameof(PyUnicode_Compare), GetUnmanagedDll(_PythonDll));
@@ -454,7 +454,7 @@ static Delegates()
         internal static delegate* unmanaged[Cdecl]<BorrowedReference, IntPtr> PyUnicode_AsUTF8 { get; }
         internal static delegate* unmanaged[Cdecl]<IntPtr, nint, IntPtr, IntPtr, NewReference> PyUnicode_DecodeUTF16 { get; }
         internal static delegate* unmanaged[Cdecl]<BorrowedReference, nint> PyUnicode_GetLength { get; }
-        internal static delegate* unmanaged[Cdecl]<BorrowedReference, IntPtr> PyUnicode_AsUnicode { get; }
+        internal static delegate* unmanaged[Cdecl]<BorrowedReference, nint, int> PyUnicode_ReadChar { get; }
         internal static delegate* unmanaged[Cdecl]<BorrowedReference, NewReference> PyUnicode_AsUTF16String { get; }
         internal static delegate* unmanaged[Cdecl]<int, NewReference> PyUnicode_FromOrdinal { get; }
         internal static delegate* unmanaged[Cdecl]<StrPtr, NewReference> PyUnicode_InternFromString { get; }

src/runtime/Runtime.cs

@@ -1370,9 +1370,10 @@ internal static IntPtr PyBytes_AsString(BorrowedReference ob)
         internal static nint PyUnicode_GetLength(BorrowedReference ob) => Delegates.PyUnicode_GetLength(ob);
 
 
-        internal static IntPtr PyUnicode_AsUnicode(BorrowedReference ob) => Delegates.PyUnicode_AsUnicode(ob);
         internal static NewReference PyUnicode_AsUTF16String(BorrowedReference ob) => Delegates.PyUnicode_AsUTF16String(ob);
 
+        internal static int PyUnicode_ReadChar(BorrowedReference ob, nint index) => Delegates.PyUnicode_ReadChar(ob, index);
+
 
 
         internal static NewReference PyUnicode_FromOrdinal(int c) => Delegates.PyUnicode_FromOrdinal(c);