better way to fool Python in the tests (now works in 2.5)

tests/run/relativeimport_T542.pyx

@@ -2,9 +2,9 @@
 import sys
 # fool Python we are in distutils
 if sys.version_info >= (3,):
-    __package__='distutils'
+    __name__='distutils.cytest_relativeimport_T542'
 else:
-    __package__=b'distutils'
+    __name__=b'distutils.cytest_relativeimport_T542'
 from distutils import cmd, core, version
 
 from .core import *

tests/run/relativeimport_star_T542.pyx

 from distutils import core, version
-__package__ = 'distutils.core' # fool Python we are in distutils
+__name__='distutils.core.cytest_relativeimport_T542' # fool Python we are in distutils
 from . import *
 
 __doc__ = """