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/Python.h

@@ -1,62 +1,36 @@
 #ifndef Py_PYTHON_H
 #define Py_PYTHON_H
-#include "libc/assert.h"
-#include "libc/calls/calls.h"
-#include "libc/calls/weirdtypes.h"
-#include "libc/errno.h"
-#include "libc/fmt/conv.h"
-#include "libc/fmt/fmt.h"
-#include "libc/limits.h"
-#include "libc/log/log.h"
-#include "libc/mem/mem.h"
-#include "libc/rand/rand.h"
-#include "libc/runtime/runtime.h"
-#include "libc/stdio/stdio.h"
-#include "libc/stdio/temp.h"
-#include "libc/str/str.h"
-#include "libc/sysv/consts/exit.h"
-#include "libc/sysv/consts/fileno.h"
-#include "libc/sysv/consts/o.h"
-#include "third_party/python/Include/patchlevel.h"
-#include "third_party/python/Include/pymacconfig.h"
-#include "third_party/python/pyconfig.h"
 /* clang-format off */
 
+/* 
+ * PYTHON DIAMOND DEPENDENCY HEADER 
+ * 
+ * If your editor isn't able to automatically insert #include lines,
+ * then this header can make development easier. It's also great for
+ * making beginner's tutorials simpler and more attractive.
+ *
+ * However it's sloppy to use something like this in the long term since
+ * it's not a scalable dependency model. It makes builds slower, because
+ * changing any single header will invalidate all the build artifacts.
+ * 
+ * So please consider doing the conscientious thing and avoid using it!
+ */
+
+#include "libc/errno.h"
+#include "third_party/python/pyconfig.h"
+#include "third_party/python/Include/patchlevel.h"
+#include "third_party/python/pyconfig.h"
 #include "third_party/python/Include/pyport.h"
 #include "third_party/python/Include/pymacro.h"
-
-/* A convenient way for code to know if clang's memory sanitizer is enabled. */
-#if defined(__has_feature)
-#  if __has_feature(memory_sanitizer)
-#    if !defined(_Py_MEMORY_SANITIZER)
-#      define _Py_MEMORY_SANITIZER
-#    endif
-#  endif
-#endif
-
 #include "third_party/python/Include/pyatomic.h"
-
-/* Debug-mode build with pymalloc implies PYMALLOC_DEBUG.
- *  PYMALLOC_DEBUG is in error if pymalloc is not in use.
- */
-#if defined(Py_DEBUG) && defined(WITH_PYMALLOC) && !defined(PYMALLOC_DEBUG)
-#define PYMALLOC_DEBUG
-#endif
-#if defined(PYMALLOC_DEBUG) && !defined(WITH_PYMALLOC)
-#error "PYMALLOC_DEBUG requires WITH_PYMALLOC"
-#endif
-
 #include "third_party/python/Include/pymath.h"
 #include "third_party/python/Include/pytime.h"
 #include "third_party/python/Include/pymem.h"
-
 #include "third_party/python/Include/object.h"
 #include "third_party/python/Include/objimpl.h"
 #include "third_party/python/Include/typeslots.h"
 #include "third_party/python/Include/pyhash.h"
-
 #include "third_party/python/Include/pydebug.h"
-
 #include "third_party/python/Include/bytearrayobject.h"
 #include "third_party/python/Include/bytesobject.h"
 #include "third_party/python/Include/unicodeobject.h"
@@ -89,12 +63,9 @@
 #include "third_party/python/Include/weakrefobject.h"
 #include "third_party/python/Include/structseq.h"
 #include "third_party/python/Include/namespaceobject.h"
-
 #include "third_party/python/Include/codecs.h"
 #include "third_party/python/Include/pyerrors.h"
-
 #include "third_party/python/Include/pystate.h"
-
 #include "third_party/python/Include/pyarena.h"
 #include "third_party/python/Include/modsupport.h"
 #include "third_party/python/Include/pythonrun.h"
@@ -104,13 +75,10 @@
 #include "third_party/python/Include/osmodule.h"
 #include "third_party/python/Include/intrcheck.h"
 #include "third_party/python/Include/import.h"
-
 #include "third_party/python/Include/abstract.h"
 #include "third_party/python/Include/bltinmodule.h"
-
 #include "third_party/python/Include/compile.h"
 #include "third_party/python/Include/eval.h"
-
 #include "third_party/python/Include/pyctype.h"
 #include "third_party/python/Include/pystrtod.h"
 #include "third_party/python/Include/pystrcmp.h"