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/_cryptmodule.inc

@@ -0,0 +1,39 @@
+/* clang-format off */
+/*[clinic input]
+preserve
+[clinic start generated code]*/
+
+PyDoc_STRVAR(crypt_crypt__doc__,
+"crypt($module, word, salt, /)\n"
+"--\n"
+"\n"
+"Hash a *word* with the given *salt* and return the hashed password.\n"
+"\n"
+"*word* will usually be a user\'s password.  *salt* (either a random 2 or 16\n"
+"character string, possibly prefixed with $digit$ to indicate the method)\n"
+"will be used to perturb the encryption algorithm and produce distinct\n"
+"results for a given *word*.");
+
+#define CRYPT_CRYPT_METHODDEF    \
+    {"crypt", (PyCFunction)crypt_crypt, METH_VARARGS, crypt_crypt__doc__},
+
+static PyObject *
+crypt_crypt_impl(PyObject *module, const char *word, const char *salt);
+
+static PyObject *
+crypt_crypt(PyObject *module, PyObject *args)
+{
+    PyObject *return_value = NULL;
+    const char *word;
+    const char *salt;
+
+    if (!PyArg_ParseTuple(args, "ss:crypt",
+        &word, &salt)) {
+        goto exit;
+    }
+    return_value = crypt_crypt_impl(module, word, salt);
+
+exit:
+    return return_value;
+}
+/*[clinic end generated code: output=8dfc88264e662df4 input=a9049054013a1b77]*/