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/_lsprof.c

@@ -1,13 +1,15 @@
-#include "Python.h"
-#include "frameobject.h"
-#include "rotatingtree.h"
+#include "libc/time/struct/tm.h"
+#include "libc/time/time.h"
+/* clang-format off */
+
+#include "third_party/python/Include/Python.h"
+#include "third_party/python/Include/frameobject.h"
+#include "third_party/python/Modules/rotatingtree.h"
 
 /*** Selection of a high-precision timer ***/
 
 #ifdef MS_WINDOWS
 
-#include <windows.h>
-
 static long long
 hpTimer(void)
 {
@@ -28,14 +30,6 @@ hpTimerUnit(void)
 
 #else  /* !MS_WINDOWS */
 
-#ifndef HAVE_GETTIMEOFDAY
-#error "This module requires gettimeofday() on non-Windows platforms!"
-#endif
-
-#include <sys/resource.h>
-#include "libc/time/time.h"
-#include "libc/time/struct/tm.h"
-
 static long long
 hpTimer(void)
 {