Do not extend PATH - instead we pass --no-warn-script-location

Signed-off-by: Bernát Gábor <bgabor8@bloomberg.net>

src/build/env.py

@@ -176,11 +176,6 @@ def _create_env_pythonhome(self):  # type: () -> None
         if env_scripts is None:  # pragma: no cover
             raise RuntimeError('Missing scripts directory in sysconfig')
 
-        exe_path = [env_scripts]
-        if 'PATH' in os.environ:
-            exe_path.append(os.environ['PATH'])
-
-        self._replace_env('PATH', os.pathsep.join(exe_path))
         self._replace_env('PYTHONPATH', os.pathsep.join(sys_path))
 
         # Point the Python interpreter to our environment

tests/test_env.py

@@ -14,10 +14,7 @@
 
 @pytest.mark.skipif(sys.version_info[0] != 2, reason='Custom isolated environment only available on Python 2')
 def test_isolated_environment_setup():
-    old_path = os.environ['PATH']
     with build.env.IsolatedEnvironment.for_current() as env:
-        if os.name != 'nt':
-            assert os.environ['PATH'] == os.pathsep.join([os.path.join(env.path, 'bin'), old_path])
         assert os.environ['PYTHONHOME'] == env.path
 
         python_path = map(os.path.normpath, os.environ['PYTHONPATH'].split(os.pathsep))