Change _py_abc to workaround current issue, and run test with PYTHONPATH

linking to Lib directory.

Lib/_py_abc.py

@@ -33,7 +33,7 @@ class ABCMeta(type):
     _abc_invalidation_counter = 0
 
     def __new__(mcls, name, bases, namespace, **kwargs):
-        cls = super().__new__(mcls, name, bases, namespace, **kwargs)
+        cls = type.__new__(mcls, name, bases, namespace, **kwargs)
         # Compute set of abstract method names
         abstracts = {name
                      for name, value in namespace.items()

tests/snippets/abc_test.py

@@ -1,4 +1 @@
-import sys
-sys.path.append('Lib')
-
 import abc

tests/test_snippets.py

@@ -27,7 +27,7 @@ TEST_DIRS = {
 }
 CPYTHON_RUNNER_DIR = os.path.abspath(os.path.join(ROOT_DIR, 'py_code_object'))
 RUSTPYTHON_RUNNER_DIR = os.path.abspath(os.path.join(ROOT_DIR))
-
+RUSTPYTHON_LIB_DIR = os.path.abspath(os.path.join(ROOT_DIR, "Lib"))
 
 @contextlib.contextmanager
 def pushd(path):
@@ -73,6 +73,7 @@ def run_via_rustpython(filename, test_type):
     env = os.environ.copy()
     env['RUST_LOG'] = 'info,cargo=error,jobserver=error'
     env['RUST_BACKTRACE'] = '1'
+    env['PYTHONPATH'] = RUSTPYTHON_LIB_DIR
 
     target = 'release'
     if env.get('CODE_COVERAGE', 'false') == 'true':