Add more ignores of ImportWarnings; these are all just potential triggers
(since they won't trigger if zlib is already sucessfully imported); they
were found by grepping .py files, instead of looking at warning output :)
diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index be06d9d..ce9ed22 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -140,7 +140,9 @@
# Ignore ImportWarnings that only occur in the source tree,
# (because of modules with the same name as source-directories in Modules/)
-for mod in ("ctypes", "gzip", "test.test_zipimport", "test.test_zlib"):
+for mod in ("ctypes", "gzip", "zipfile", "tarfile", "encodings.zlib_codec",
+ "test.test_zipimport", "test.test_zlib", "test.test_zipfile",
+ "test.test_codecs", "test.string_tests"):
warnings.filterwarnings(module=".*%s$" % (mod,),
action="ignore", category=ImportWarning)