Perform build and magnum tuning

Building o//third_party/python now takes 5 seconds on my PC

This change works towards modifying Python to use runtime dispatching
when appropriate. For example, when loading the magnums in the socket
module, it's a good idea to check if the magnum is zero, because that
means the local system platform doesn't support it.

third_party/python/Modules/clinic/_cursesmodule.inc

@@ -0,0 +1,76 @@
+/* clang-format off */
+/*[clinic input]
+preserve
+[clinic start generated code]*/
+
+PyDoc_STRVAR(curses_window_addch__doc__,
+"addch([y, x,] ch, [attr])\n"
+"Paint character ch at (y, x) with attributes attr.\n"
+"\n"
+"  y\n"
+"    Y-coordinate.\n"
+"  x\n"
+"    X-coordinate.\n"
+"  ch\n"
+"    Character to add.\n"
+"  attr\n"
+"    Attributes for the character.\n"
+"\n"
+"Paint character ch at (y, x) with attributes attr,\n"
+"overwriting any character previously painted at that location.\n"
+"By default, the character position and attributes are the\n"
+"current settings for the window object.");
+
+#define CURSES_WINDOW_ADDCH_METHODDEF    \
+    {"addch", (PyCFunction)curses_window_addch, METH_VARARGS, curses_window_addch__doc__},
+
+static PyObject *
+curses_window_addch_impl(PyCursesWindowObject *self, int group_left_1, int y,
+                         int x, PyObject *ch, int group_right_1, long attr);
+
+static PyObject *
+curses_window_addch(PyCursesWindowObject *self, PyObject *args)
+{
+    PyObject *return_value = NULL;
+    int group_left_1 = 0;
+    int y = 0;
+    int x = 0;
+    PyObject *ch;
+    int group_right_1 = 0;
+    long attr = 0;
+
+    switch (PyTuple_GET_SIZE(args)) {
+        case 1:
+            if (!PyArg_ParseTuple(args, "O:addch", &ch)) {
+                goto exit;
+            }
+            break;
+        case 2:
+            if (!PyArg_ParseTuple(args, "Ol:addch", &ch, &attr)) {
+                goto exit;
+            }
+            group_right_1 = 1;
+            break;
+        case 3:
+            if (!PyArg_ParseTuple(args, "iiO:addch", &y, &x, &ch)) {
+                goto exit;
+            }
+            group_left_1 = 1;
+            break;
+        case 4:
+            if (!PyArg_ParseTuple(args, "iiOl:addch", &y, &x, &ch, &attr)) {
+                goto exit;
+            }
+            group_right_1 = 1;
+            group_left_1 = 1;
+            break;
+        default:
+            PyErr_SetString(PyExc_TypeError, "curses.window.addch requires 1 to 4 arguments");
+            goto exit;
+    }
+    return_value = curses_window_addch_impl(self, group_left_1, y, x, ch, group_right_1, attr);
+
+exit:
+    return return_value;
+}
+/*[clinic end generated code: output=13ffc5f8d79cbfbf input=a9049054013a1b77]*/