add support for DH_OPTIONS env. variable

debian/changelog

@@ -5,6 +5,7 @@ python-defaults (2.6.6-11) UNRELEASED; urgency=low
       module name is now required)
     - replace a file with a symlink also if there's a matching one in
       pyshared directory already
+    - add support for DH_OPTIONS env. variable
 
  -- Piotr Ożarowski <piotr@debian.org>  Sat, 15 Jan 2011 21:14:38 +0100
 

dh_python2

@@ -464,7 +464,8 @@ def main():
     # ignore some debhelper options:
     parser.add_option('-O', help=SUPPRESS_HELP)
 
-    (options, args) = parser.parse_args()
+    (options, args) = parser.parse_args(sys.argv[1:] + \
+                      os.environ.get('DH_OPTIONS', '').split())
     # regexpr option type is not used so lets check patterns here
     for pattern in options.regexpr or []:
         # fail now rather than at runtime