tests: Disable bz2/gzip/lmza under CPython

Since we raise an Exception that these are not supported

Author: jonnor

test_zipfile/support.py

@@ -38,20 +38,23 @@ def requires_gzip(reason='requires gzip'):
         import gzip
     except ImportError:
         gzip = None
+    gzip = None # explicitly not supported at the moment
     return unittest.skipUnless(gzip, reason)
 
 def requires_bz2(reason='requires bz2'):
     try:
         import bz2
     except ImportError:
         bz2 = None
+    bz2 = None # explicitly not supported at the moment
     return unittest.skipUnless(bz2, reason)
 
 def requires_lzma(reason='requires lzma'):
     try:
         import lzma
     except ImportError:
         lzma = None
+    lzma = None # explicitly not supported at the moment
     return unittest.skipUnless(lzma, reason)
 
 def findfile(filename, subdir=None):