avoid false positives

e.g.:
ldd: warning: you do not have execution permission for `software/develop-eggs/rdiff_backup-1.0.5-py2.6-linux-i686.egg/EGG-INFO/zip-safe'
lddlibc4: cannot read header from `software/develop-eggs/rdiff_backup-1.0.5-py2.6-linux-i686.egg/EGG-INFO/zip-safe'


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@42243 20353a03-c40f-0410-a6d1-a30d3c3de9de

buildout/tests/assertSoftware.py

@@ -149,7 +149,7 @@ def readLddInfoList(f):
   link_list = []
   a = link_list.append
   result = popen.communicate()[0]
-  if 'not a dynamic executable' in result:
+  if 'not a dynamic executable' in result or 'cannot read header' in result:
     return link_list
   for line in result.split('\n'):
     line = line.strip()