Issue #17095: Temporarily revert getpath.c change that added the Modules
directory to sys.path when running from a build directory.  That has
proven to be problematic for several standard library modules with
C extension modules whose builds can fail on some platforms.

--HG--
branch : 3.4
Restored re pickling test.

--HG--
branch : 3.4
Issue #22166: clear codec caches in test_codecs

--HG--
branch : 3.4