Added build config to get python.com

Modules/Setup and Modules/Setup.local contain the build recipes for
various extensions, wrote a custom script to translate them for
python.mk. Modules/config.c needs to be changed if any extensions are
removed or added.

Most of the source modifications are for missing headers or compile time
build vars like ABIFLAGS.

Created separate mk files for the C extensions and the Python stdlib.
Can use find for adding the python files to the APE ZIP store, but right
now necessary files are just hardcoded.

python.com loads but some build configs are still missing (showing 1 Jan
1970 as time of compilation).

third_party/python/Modules/posixmodule.c

@@ -26,6 +26,9 @@
 
 #include "Python.h"
 #include "structmember.h"
+#include "libc/sock/sock.h"
+#include "libc/runtime/sysconf.h"
+#include "libc/runtime/dlfcn.h"
 #ifndef MS_WINDOWS
 #include "posixmodule.h"
 #else
@@ -85,7 +88,7 @@ corresponding Unix manual entries for more information on calls.");
 #endif
 
 #ifdef HAVE_SYSEXITS_H
-#include <sysexits.h>
+#include "libc/sysv/consts/ex.h"
 #endif /* HAVE_SYSEXITS_H */
 
 #ifdef HAVE_SYS_LOADAVG_H
@@ -148,7 +151,8 @@ corresponding Unix manual entries for more information on calls.");
 #if defined(MS_WINDOWS)
 #  define TERMSIZE_USE_CONIO
 #elif defined(HAVE_SYS_IOCTL_H)
-#  include <sys/ioctl.h>
+#include "libc/calls/calls.h"
+#include "libc/sysv/consts/fd.h"
 #  if defined(HAVE_TERMIOS_H)
 #    include <termios.h>
 #  endif
@@ -263,7 +267,7 @@ extern int lstat(const char *, struct stat *);
 #endif /* HAVE_SYS_UTIME_H */
 
 #ifdef HAVE_SYS_TIMES_H
-#include <sys/times.h>
+// #include <sys/times.h>
 #endif /* HAVE_SYS_TIMES_H */
 
 #ifdef HAVE_SYS_PARAM_H
@@ -5790,7 +5794,7 @@ error:
 
 #if defined(HAVE_OPENPTY) || defined(HAVE_FORKPTY) || defined(HAVE_DEV_PTMX)
 #ifdef HAVE_PTY_H
-#include <pty.h>
+#include "libc/calls/termios.h"
 #else
 #ifdef HAVE_LIBUTIL_H
 #include <libutil.h>