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/Include/pythread.h

@@ -1,5 +1,6 @@
 #ifndef Py_PYTHREAD_H
 #define Py_PYTHREAD_H
+#include "third_party/python/Include/object.h"
 COSMOPOLITAN_C_START_
 /* clang-format off */
 
@@ -14,14 +15,14 @@ typedef enum PyLockStatus {
     PY_LOCK_INTR
 } PyLockStatus;
 
-PyAPI_FUNC(void) PyThread_init_thread(void);
-PyAPI_FUNC(long) PyThread_start_new_thread(void (*)(void *), void *);
-PyAPI_FUNC(void) PyThread_exit_thread(void);
-PyAPI_FUNC(long) PyThread_get_thread_ident(void);
+void PyThread_init_thread(void);
+long PyThread_start_new_thread(void (*)(void *), void *);
+void PyThread_exit_thread(void);
+long PyThread_get_thread_ident(void);
 
-PyAPI_FUNC(PyThread_type_lock) PyThread_allocate_lock(void);
-PyAPI_FUNC(void) PyThread_free_lock(PyThread_type_lock);
-PyAPI_FUNC(int) PyThread_acquire_lock(PyThread_type_lock, int);
+PyThread_type_lock PyThread_allocate_lock(void);
+void PyThread_free_lock(PyThread_type_lock);
+int PyThread_acquire_lock(PyThread_type_lock, int);
 #define WAIT_LOCK	1
 #define NOWAIT_LOCK	0
 
@@ -57,28 +58,28 @@ PyAPI_FUNC(int) PyThread_acquire_lock(PyThread_type_lock, int);
    call will return PY_LOCK_INTR.  The caller may reattempt to acquire the
    lock.
 */
-PyAPI_FUNC(PyLockStatus) PyThread_acquire_lock_timed(PyThread_type_lock,
+PyLockStatus PyThread_acquire_lock_timed(PyThread_type_lock,
                                                      PY_TIMEOUT_T microseconds,
                                                      int intr_flag);
 
-PyAPI_FUNC(void) PyThread_release_lock(PyThread_type_lock);
+void PyThread_release_lock(PyThread_type_lock);
 
-PyAPI_FUNC(size_t) PyThread_get_stacksize(void);
-PyAPI_FUNC(int) PyThread_set_stacksize(size_t);
+size_t PyThread_get_stacksize(void);
+int PyThread_set_stacksize(size_t);
 
 #if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03030000
-PyAPI_FUNC(PyObject*) PyThread_GetInfo(void);
+PyObject* PyThread_GetInfo(void);
 #endif
 
 /* Thread Local Storage (TLS) API */
-PyAPI_FUNC(int) PyThread_create_key(void);
-PyAPI_FUNC(void) PyThread_delete_key(int);
-PyAPI_FUNC(int) PyThread_set_key_value(int, void *);
-PyAPI_FUNC(void *) PyThread_get_key_value(int);
-PyAPI_FUNC(void) PyThread_delete_key_value(int key);
+int PyThread_create_key(void);
+void PyThread_delete_key(int);
+int PyThread_set_key_value(int, void *);
+void * PyThread_get_key_value(int);
+void PyThread_delete_key_value(int key);
 
 /* Cleanup after a fork */
-PyAPI_FUNC(void) PyThread_ReInitTLS(void);
+void PyThread_ReInitTLS(void);
 
 COSMOPOLITAN_C_END_
 #endif /* !Py_PYTHREAD_H */