Ignore ctypes leaks, but add a test case so we do not forget.

Lib/test/leakers/test_ctypes.py

+
+# Taken from Lib/ctypes/test/test_keeprefs.py
+# When this leak is fixed, remember to remove from Misc/build.sh LEAKY_TESTS.
+
+from ctypes import Structure, c_int
+
+def leak():
+    class POINT(Structure):
+        _fields_ = [("x", c_int)]
+    class RECT(Structure):
+        _fields_ = [("ul", POINT)]

Misc/build.sh

@@ -59,7 +59,7 @@ REFLOG="build/reflog.txt.out"
 # test_generators really leaks.  Since test_generators probably won't
 # be fixed real soon, disable warning about it for now.
 # The entire leak report will be mailed if any test not in this list leaks.
-LEAKY_TESTS="test_(capi|cfgparser|charmapcodec|cmd_line|compiler|filecmp|generators|quopri|socket|threaded_import|threadedtempfile|threading|threading_local|urllib2)"
+LEAKY_TESTS="test_(capi|cfgparser|charmapcodec|cmd_line|compiler|ctypes|filecmp|generators|quopri|socket|threaded_import|threadedtempfile|threading|threading_local|urllib2)"
 
 # Change this flag to "yes" for old releases to just update/build the docs.
 BUILD_DISABLED="no"