title: Import error: No module named _sysconfigdata
body: <p>Anaconda python 2.7.14 scripts that import either matplotlib or scipy and are compiled with pyinstaller 3.3 fail with identical errors: 
  ImportError: No module named _sysconfigdata [54885] Failed to execute script pyi_rth_pkgres.</p>
  
  <p>Those scripts execute perfectly in the python envirnnment, e.g. python myscript.py.  When the executable is run I get this:</p>
  
  <pre><code>Traceback (most recent call last):
    File "site-packages/PyInstaller/loader/rthooks/pyi_rth_pkgres.py", line 11, in &lt;module&gt;
    File "lib/python2.7/site-packages/PyInstaller/loader/pyimod03_importers.py", line 396, in load_module
    File "site-packages/pkg_resources/__init__.py", line 1040, in &lt;module&gt;
    File "site-packages/pkg_resources/__init__.py", line 1043, in Environment
    File "site-packages/pkg_resources/__init__.py", line 272, in get_supported_platform
    File "site-packages/pkg_resources/__init__.py", line 478, in get_build_platform
    File "sysconfig.py", line 617, in get_platform
    File "sysconfig.py", line 481, in get_config_vars
    File "sysconfig.py", line 364, in _init_posix
  ImportError: No module named _sysconfigdata
  [54885] Failed to execute script pyi_rth_pkgres
  </code></pre>