Undiamond Python headers

This change gets the Python codebase into a state where it conforms to
the conventions of this codebase. It's now possible to include headers
from Python, without worrying about ordering. Python has traditionally
solved that problem by "diamonding" everything in Python.h, but that's
problematic since it means any change to any Python header invalidates
all the build artifacts. Lastly it makes tooling not work. Since it is
hard to explain to Emacs when I press C-c C-h to add an import line it
shouldn't add the header that actually defines the symbol, and instead
do follow the nonstandard Python convention.

Progress has been made on letting Python load source code from the zip
executable structure via the standard C library APIs. System calss now
recognizes zip!FILENAME alternative URIs as equivalent to zip:FILENAME
since Python uses colon as its delimiter.

Some progress has been made on embedding the notice license terms into
the Python object code. This is easier said than done since Python has
an extremely complicated ownership story.

- Some termios APIs have been added
- Implement rewinddir() dirstream API
- GetCpuCount() API added to Cosmopolitan Libc
- More bugs in Cosmopolitan Libc have been fixed
- zipobj.com now has flags for mangling the path
- Fixed bug a priori with sendfile() on certain BSDs
- Polyfill F_DUPFD and F_DUPFD_CLOEXEC across platforms
- FIOCLEX / FIONCLEX now polyfilled for fast O_CLOEXEC changes
- APE now supports a hybrid solution to no-self-modify for builds
- Many BSD-only magnums added, e.g. O_SEARCH, O_SHLOCK, SF_NODISKIO

third_party/python/Modules/_multiprocessing/multiprocessing.c

@@ -1,3 +1,4 @@
+#include "third_party/python/Modules/_multiprocessing/multiprocessing.h"
 /* clang-format off */
 /*
  * Extension module used by multiprocessing package
@@ -8,9 +9,6 @@
  * Licensed to PSF under a Contributor Agreement.
  */
 
-#include "multiprocessing.h"
-
-
 /*
  * Function which raises exceptions based on error codes
  */

third_party/python/Modules/_multiprocessing/multiprocessing.h

@@ -1,42 +1,25 @@
 #ifndef MULTIPROCESSING_H
 #define MULTIPROCESSING_H
-/* clang-format off */
-
 #define PY_SSIZE_T_CLEAN
-
-#include "Python.h"
-#include "structmember.h"
-#include "pythread.h"
+#include "third_party/python/Include/pythread.h"
+#include "third_party/python/Include/structmember.h"
+#include "third_party/python/pyconfig.h"
+/* clang-format off */
 
 /*
  * Platform includes and definitions
  */
-
-#ifdef MS_WINDOWS
-#  define WIN32_LEAN_AND_MEAN
-#  include <windows.h>
-#  include <winsock2.h>
-#  include <process.h>               /* getpid() */
-#  ifdef Py_DEBUG
-#    include <crtdbg.h>
-#  endif
-#  define SEM_HANDLE HANDLE
-#  define SEM_VALUE_MAX LONG_MAX
-#else
-#  include <fcntl.h>                 /* O_CREAT and O_EXCL */
-#  if defined(HAVE_SEM_OPEN) && !defined(POSIX_SEMAPHORES_NOT_ENABLED)
-#    include <semaphore.h>
-     typedef sem_t *SEM_HANDLE;
-#  endif
-#  define HANDLE int
-#  define SOCKET int
-#  define BOOL int
-#  define UINT32 uint32_t
-#  define INT32 int32_t
-#  define TRUE 1
-#  define FALSE 0
-#  define INVALID_HANDLE_VALUE (-1)
+#if defined(HAVE_SEM_OPEN) && !defined(POSIX_SEMAPHORES_NOT_ENABLED)
+typedef sem_t *SEM_HANDLE;
 #endif
+#define HANDLE int
+#define SOCKET int
+#define BOOL int
+#define UINT32 uint32_t
+#define INT32 int32_t
+#define TRUE 1
+#define FALSE 0
+#define INVALID_HANDLE_VALUE (-1)
 
 /*
  * Issue 3110 - Solaris does not define SEM_VALUE_MAX

third_party/python/Modules/_multiprocessing/semaphore.c

@@ -1,3 +1,5 @@
+#include "third_party/python/Modules/_multiprocessing/multiprocessing.h"
+/* clang-format off */
 /*
  * A type which wraps a semaphore
  *
@@ -7,8 +9,6 @@
  * Licensed to PSF under a Contributor Agreement.
  */
 
-#include "multiprocessing.h"
-
 enum { RECURSIVE_MUTEX, SEMAPHORE };
 
 typedef struct {