Shift packaging to use shiny extern.

pkg_resources/_vendor/packaging/markers.py

@@ -8,9 +8,9 @@ import os
 import platform
 import sys
 
-from pkg_resources._vendor.pyparsing import ParseException, ParseResults, stringStart, stringEnd
-from pkg_resources._vendor.pyparsing import ZeroOrMore, Group, Forward, QuotedString
-from pkg_resources._vendor.pyparsing import Literal as L  # noqa
+from pkg_resources.extern.pyparsing import ParseException, ParseResults, stringStart, stringEnd
+from pkg_resources.extern.pyparsing import ZeroOrMore, Group, Forward, QuotedString
+from pkg_resources.extern.pyparsing import Literal as L  # noqa
 
 from ._compat import string_types
 from .specifiers import Specifier, InvalidSpecifier

pkg_resources/_vendor/packaging/requirements.py

@@ -6,10 +6,10 @@ from __future__ import absolute_import, division, print_function
 import string
 import re
 
-from pkg_resources._vendor.pyparsing import stringStart, stringEnd, originalTextFor, ParseException
-from pkg_resources._vendor.pyparsing import ZeroOrMore, Word, Optional, Regex, Combine
-from pkg_resources._vendor.pyparsing import Literal as L  # noqa
-from pkg_resources._vendor.six.moves.urllib import parse as urlparse
+from pkg_resources.extern.pyparsing import stringStart, stringEnd, originalTextFor, ParseException
+from pkg_resources.extern.pyparsing import ZeroOrMore, Word, Optional, Regex, Combine
+from pkg_resources.extern.pyparsing import Literal as L  # noqa
+from pkg_resources.extern.six.moves.urllib import parse as urlparse
 
 from .markers import MARKER_EXPR, Marker
 from .specifiers import LegacySpecifier, Specifier, SpecifierSet

pkg_resources/extern/__init__.py

@@ -67,5 +67,5 @@ class VendorImporter:
         if self not in sys.meta_path:
             sys.meta_path.append(self)
 
-names = 'packaging', 'six'
+names = 'packaging', 'pyparsing', 'six'
 VendorImporter(__name__, names).install()