fix some tests

.travis.yml

@@ -4,7 +4,7 @@ python:
   - 2.6
   - 2.5
 install:
-  - python dev.py -d
+  - python -S dev.py -d
 
 script:
   - bin/test

src/zc/buildout/testing.py

@@ -172,6 +172,7 @@ def bdist_egg(setup, executable, dest):
 
 def sys_install(setup, dest):
     _runsetup(setup, sys.executable, 'install', '--install-purelib', dest,
+              '--install-scripts', dest,
               '--record', os.path.join(dest, '__added_files__'),
               '--single-version-externally-managed')