python-pycparser: new package

From the README:

pycparser is a parser for the C language, written in pure Python. It is a
module designed to be easily integrated into applications that need to parse
C source code.

This depends on python-ply, which is in PR #1956

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/python-pycparser/patches/001-use-external-ply.patch

@@ -0,0 +1,41 @@
+diff --git a/pycparser/c_lexer.py b/pycparser/c_lexer.py
+index cbb9d26..cbd7742 100644
+--- a/pycparser/c_lexer.py
++++ b/pycparser/c_lexer.py
+@@ -9,8 +9,8 @@
+ import re
+ import sys
+ 
+-from .ply import lex
+-from .ply.lex import TOKEN
++from ply import lex
++from ply.lex import TOKEN
+ 
+ 
+ class CLexer(object):
+diff --git a/pycparser/c_parser.py b/pycparser/c_parser.py
+index f4f7453..5c0ca88 100644
+--- a/pycparser/c_parser.py
++++ b/pycparser/c_parser.py
+@@ -8,7 +8,7 @@
+ #------------------------------------------------------------------------------
+ import re
+ 
+-from .ply import yacc
++from ply import yacc
+ 
+ from . import c_ast
+ from .c_lexer import CLexer
+diff --git a/setup.py b/setup.py
+index fdccbb3..036a10b 100644
+--- a/setup.py
++++ b/setup.py
+@@ -49,7 +49,7 @@ setup(
+     classifiers = [
+         'Programming Language :: Python :: 2',
+         'Programming Language :: Python :: 3',],
+-    packages=['pycparser', 'pycparser.ply'],
++    packages=['pycparser'],
+     package_data={'pycparser': ['*.cfg']},
+     cmdclass={'install': install, 'sdist': sdist},
+ )