python: remove the default optimization

We had hard coded python-native and python's default optimization to 1,
which made the "assert" statement didn't work, and removed the "-O/-OO"
(optimization options), the target python had a "-N" option to disable
the default optimization, but the native python didn't.

I think that we can set the environment variable PYTHONOPTIMIZE or use
"python -O" if we need to optimize, but I'm not sure whether we need to
set it by default, it would confuse the user or cause/hide unexpected
problems if the "assert" doesn't work.

[YOCTO #4427]

(From OE-Core rev: 165ed464bbb9bf985dde9d8c15d000809901fff6)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python-native/04-default-is-optimized.patch

@@ -1,20 +0,0 @@
-Upstream-Status: Inappropriate [embedded specific]
-
-# When compiling for an embedded system, we need every bit of
-# performance we can get. default to optimized with the option
-# of opt-out.
-# Signed-Off: Michael 'Mickey' Lauer <mickey@vanille-media.de>
-
-Index: Python-2.6.1/Python/compile.c
-===================================================================
---- Python-2.6.1.orig/Python/compile.c
-+++ Python-2.6.1/Python/compile.c
-@@ -32,7 +32,7 @@
- #include "symtable.h"
- #include "opcode.h"
- 
--int Py_OptimizeFlag = 0;
-+int Py_OptimizeFlag = 1;
- 
- #define DEFAULT_BLOCK_SIZE 16
- #define DEFAULT_BLOCKS 8