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/Objects/clinic/unicodeobject.inc

@@ -0,0 +1,42 @@
+/*[clinic input]
+preserve
+[clinic start generated code]*/
+
+PyDoc_STRVAR(unicode_maketrans__doc__,
+"maketrans(x, y=None, z=None, /)\n"
+"--\n"
+"\n"
+"Return a translation table usable for str.translate().\n"
+"\n"
+"If there is only one argument, it must be a dictionary mapping Unicode\n"
+"ordinals (integers) or characters to Unicode ordinals, strings or None.\n"
+"Character keys will be then converted to ordinals.\n"
+"If there are two arguments, they must be strings of equal length, and\n"
+"in the resulting dictionary, each character in x will be mapped to the\n"
+"character at the same position in y. If there is a third argument, it\n"
+"must be a string, whose characters will be mapped to None in the result.");
+
+#define UNICODE_MAKETRANS_METHODDEF    \
+    {"maketrans", (PyCFunction)unicode_maketrans, METH_VARARGS|METH_STATIC, unicode_maketrans__doc__},
+
+static PyObject *
+unicode_maketrans_impl(PyObject *x, PyObject *y, PyObject *z);
+
+static PyObject *
+unicode_maketrans(void *null, PyObject *args)
+{
+    PyObject *return_value = NULL;
+    PyObject *x;
+    PyObject *y = NULL;
+    PyObject *z = NULL;
+
+    if (!PyArg_ParseTuple(args, "O|UU:maketrans",
+        &x, &y, &z)) {
+        goto exit;
+    }
+    return_value = unicode_maketrans_impl(x, y, z);
+
+exit:
+    return return_value;
+}
+/*[clinic end generated code: output=4a86dd108d92d104 input=a9049054013a1b77]*/