bpo-20443: _PyConfig_Read() gets the absolute path of run_filename (GH-14053)

Python now gets the absolute path of the script filename specified on
the command line (ex: "python3 script.py"): the __file__ attribute of
the __main__ module, sys.argv[0] and sys.path[0] become an absolute
path, rather than a relative path.

* Add _Py_isabs() and _Py_abspath() functions.
* _PyConfig_Read() now tries to get the absolute path of
  run_filename, but keeps the relative path if _Py_abspath() fails.
* Reimplement os._getfullpathname() using _Py_abspath().
* Use _Py_isabs() in getpath.c.

Lib/test/test_embed.py

@@ -805,9 +805,10 @@ class InitConfigTests(EmbeddingTestsMixin, unittest.TestCase):
         preconfig = {
             'allocator': PYMEM_ALLOCATOR_DEBUG,
         }
+        script_abspath = os.path.abspath('script.py')
         config = {
-            'argv': ['script.py'],
-            'run_filename': 'script.py',
+            'argv': [script_abspath],
+            'run_filename': script_abspath,
             'dev_mode': 1,
             'faulthandler': 1,
             'warnoptions': ['default'],