Improve Libc by making Python work even better

Actually Portable Python is now outperforming the Python binaries
that come bundled with Linux distros, at things like HTTP serving.
You can now have a fully featured Python install in just one .com
file that runs on six operating systems and is about 10mb in size.
With tuning, the tiniest is ~1mb. We've got most of the libraries
working, including pysqlite, and the repl now feels very pleasant.
The things you can't do quite yet are: threads and shared objects
but that can happen in the future, if the community falls in love
with this project and wants to see it developed further. Changes:

- Add siginterrupt()
- Add sqlite3 to Python
- Add issymlink() helper
- Make GetZipCdir() faster
- Add tgamma() and finite()
- Add legacy function lutimes()
- Add readlink() and realpath()
- Use heap allocations when appropriate
- Reorganize Python into two-stage build
- Save Lua / Python shell history to dotfile
- Integrate Python Lib embedding into linkage
- Make isregularfile() and isdirectory() go faster
- Make Python shell auto-completion work perfectly
- Make crash reports work better if changed directory
- Fix Python+NT open() / access() flag overflow error
- Disable Python tests relating to \N{LONG NAME} syntax
- Have Python REPL copyright() show all notice embeddings

The biggest technical challenge at the moment is working around
when Python tries to be too clever about filenames.

third_party/python/Include/import.h

@@ -107,6 +107,7 @@ struct _inittab {
     const char *name;           /* ASCII encoded string */
     PyObject* (*initfunc)(void);
 };
+extern struct _inittab _PyImport_Inittab[];
 extern struct _inittab * PyImport_Inittab;
 int PyImport_ExtendInittab(struct _inittab *newtab);
 #endif /* Py_LIMITED_API */
@@ -129,6 +130,7 @@ struct _frozen {
    collection of frozen modules: */
 
 extern const struct _frozen * PyImport_FrozenModules;
+extern const struct _frozen _PyImport_FrozenModules[];
 #endif
 
 COSMOPOLITAN_C_END_

third_party/python/Include/osdefs.h

@@ -1,15 +1,12 @@
 #ifndef Py_OSDEFS_H
 #define Py_OSDEFS_H
 COSMOPOLITAN_C_START_
-/* clang-format off */
-
-/* Operating system dependencies */
 
 #ifdef MS_WINDOWS
-#define SEP L'\\'
-#define ALTSEP L'/'
+#define SEP        L'\\'
+#define ALTSEP     L'/'
 #define MAXPATHLEN 256
-#define DELIM L';'
+#define DELIM      L';'
 #endif
 
 /* Filename separator */

third_party/python/Include/yoink.h

@@ -0,0 +1,18 @@
+#ifndef COSMOPOLITAN_THIRD_PARTY_PYTHON_INCLUDE_YOINK_H_
+#define COSMOPOLITAN_THIRD_PARTY_PYTHON_INCLUDE_YOINK_H_
+#include "libc/dce.h"
+
+#if !IsTiny()
+#define PYTHON_YOINK(s)          \
+  __asm__(".section .yoink\n\t"  \
+          "nopl\t\"" s "\"\n\t"  \
+          "nopl\t\"" s "c\"\n\t" \
+          ".previous")
+#else
+#define PYTHON_YOINK(s)          \
+  __asm__(".section .yoink\n\t"  \
+          "nopl\t\"" s "c\"\n\t" \
+          ".previous")
+#endif
+
+#endif /* COSMOPOLITAN_THIRD_PARTY_PYTHON_INCLUDE_YOINK_H_ */