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/hashtable.c

@@ -1,3 +1,4 @@
+/* clang-format off */
 /* The implementation of the hash table (_Py_hashtable_t) is based on the
    cfuhash project:
    http://sourceforge.net/projects/libcfu/
@@ -44,8 +45,8 @@
    ----------------------------------
 */
 
-#include "Python.h"
-#include "hashtable.h"
+#include "third_party/python/Include/Python.h"
+#include "third_party/python/Modules/hashtable.h"
 
 #define HASHTABLE_MIN_SIZE 16
 #define HASHTABLE_HIGH 0.50