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/sha256module.inc

@@ -0,0 +1,128 @@
+/* clang-format off */
+/*[clinic input]
+preserve
+[clinic start generated code]*/
+
+PyDoc_STRVAR(SHA256Type_copy__doc__,
+"copy($self, /)\n"
+"--\n"
+"\n"
+"Return a copy of the hash object.");
+
+#define SHA256TYPE_COPY_METHODDEF    \
+    {"copy", (PyCFunction)SHA256Type_copy, METH_NOARGS, SHA256Type_copy__doc__},
+
+static PyObject *
+SHA256Type_copy_impl(SHAobject *self);
+
+static PyObject *
+SHA256Type_copy(SHAobject *self, PyObject *Py_UNUSED(ignored))
+{
+    return SHA256Type_copy_impl(self);
+}
+
+PyDoc_STRVAR(SHA256Type_digest__doc__,
+"digest($self, /)\n"
+"--\n"
+"\n"
+"Return the digest value as a bytes object.");
+
+#define SHA256TYPE_DIGEST_METHODDEF    \
+    {"digest", (PyCFunction)SHA256Type_digest, METH_NOARGS, SHA256Type_digest__doc__},
+
+static PyObject *
+SHA256Type_digest_impl(SHAobject *self);
+
+static PyObject *
+SHA256Type_digest(SHAobject *self, PyObject *Py_UNUSED(ignored))
+{
+    return SHA256Type_digest_impl(self);
+}
+
+PyDoc_STRVAR(SHA256Type_hexdigest__doc__,
+"hexdigest($self, /)\n"
+"--\n"
+"\n"
+"Return the digest value as a string of hexadecimal digits.");
+
+#define SHA256TYPE_HEXDIGEST_METHODDEF    \
+    {"hexdigest", (PyCFunction)SHA256Type_hexdigest, METH_NOARGS, SHA256Type_hexdigest__doc__},
+
+static PyObject *
+SHA256Type_hexdigest_impl(SHAobject *self);
+
+static PyObject *
+SHA256Type_hexdigest(SHAobject *self, PyObject *Py_UNUSED(ignored))
+{
+    return SHA256Type_hexdigest_impl(self);
+}
+
+PyDoc_STRVAR(SHA256Type_update__doc__,
+"update($self, obj, /)\n"
+"--\n"
+"\n"
+"Update this hash object\'s state with the provided string.");
+
+#define SHA256TYPE_UPDATE_METHODDEF    \
+    {"update", (PyCFunction)SHA256Type_update, METH_O, SHA256Type_update__doc__},
+
+PyDoc_STRVAR(_sha256_sha256__doc__,
+"sha256($module, /, string=b\'\')\n"
+"--\n"
+"\n"
+"Return a new SHA-256 hash object; optionally initialized with a string.");
+
+#define _SHA256_SHA256_METHODDEF    \
+    {"sha256", (PyCFunction)_sha256_sha256, METH_FASTCALL, _sha256_sha256__doc__},
+
+static PyObject *
+_sha256_sha256_impl(PyObject *module, PyObject *string);
+
+static PyObject *
+_sha256_sha256(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *return_value = NULL;
+    static const char * const _keywords[] = {"string", NULL};
+    static _PyArg_Parser _parser = {"|O:sha256", _keywords, 0};
+    PyObject *string = NULL;
+
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
+        &string)) {
+        goto exit;
+    }
+    return_value = _sha256_sha256_impl(module, string);
+
+exit:
+    return return_value;
+}
+
+PyDoc_STRVAR(_sha256_sha224__doc__,
+"sha224($module, /, string=b\'\')\n"
+"--\n"
+"\n"
+"Return a new SHA-224 hash object; optionally initialized with a string.");
+
+#define _SHA256_SHA224_METHODDEF    \
+    {"sha224", (PyCFunction)_sha256_sha224, METH_FASTCALL, _sha256_sha224__doc__},
+
+static PyObject *
+_sha256_sha224_impl(PyObject *module, PyObject *string);
+
+static PyObject *
+_sha256_sha224(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *return_value = NULL;
+    static const char * const _keywords[] = {"string", NULL};
+    static _PyArg_Parser _parser = {"|O:sha224", _keywords, 0};
+    PyObject *string = NULL;
+
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
+        &string)) {
+        goto exit;
+    }
+    return_value = _sha256_sha224_impl(module, string);
+
+exit:
+    return return_value;
+}
+/*[clinic end generated code: output=3babbe1e753c1a38 input=a9049054013a1b77]*/