Add test/thirdparty/cpython.sh

test/thirdparty/cpython.sh

+#!/bin/bash
+repo='git@github.com:python/cpython.git'
+. test/thirdparty/common
+git reset --hard c75330605d4795850ec74fdc4d69aa5d92f76c00
+
+# Python's './configure' command misidentifies chibicc as icc
+# (Intel C Compiler) because icc is a substring of chibicc.
+# Modify the configure file as a workaround.
+sed -i -e 1996,2011d configure.ac
+autoreconf
+
+CC=$chibicc ./configure
+$make clean
+$make
+$make test