Steal the trick from test_compiler to print out a slow msg.

This will hopefully get the buildbots to pass.  Not sure this
test will be feasible or even work.  But everything is red now,
so it can't get much worse.

Lib/test/test_zipfile64.py

@@ -14,6 +14,8 @@ except ImportError:
     zlib = None
 
 import zipfile, os, unittest
+import time
+import sys
 
 from StringIO import StringIO
 from tempfile import TemporaryFile
@@ -22,6 +24,9 @@ from test.test_support import TESTFN, run_unittest
 
 TESTFN2 = TESTFN + "2"
 
+# How much time in seconds can pass before we print a 'Still working' message.
+_PRINT_WORKING_MSG_INTERVAL = 5 * 60
+
 class TestsWithSourceFile(unittest.TestCase):
     def setUp(self):
         line_gen = ("Test of zipfile line %d." % i for i in range(0, 1000000))
@@ -37,14 +42,27 @@ class TestsWithSourceFile(unittest.TestCase):
         filecount = int(((1 << 32) / len(self.data)) * 1.5)
         zipfp = zipfile.ZipFile(f, "w", compression, allowZip64=True)
 
+        next_time = time.time() + _PRINT_WORKING_MSG_INTERVAL
         for num in range(filecount):
             zipfp.writestr("testfn%d"%(num,), self.data)
+            # Print still working message since this test can be really slow
+            if next_time <= time.time():
+                next_time = time.time() + _PRINT_WORKING_MSG_INTERVAL
+                print >>sys.__stdout__, \
+                   '  zipTest still working, be patient...'
+                sys.__stdout__.flush()
         zipfp.close()
 
         # Read the ZIP archive
         zipfp = zipfile.ZipFile(f, "r", compression)
         for num in range(filecount):
             self.assertEqual(zipfp.read("testfn%d"%(num,)), self.data)
+            # Print still working message since this test can be really slow
+            if next_time <= time.time():
+                next_time = time.time() + _PRINT_WORKING_MSG_INTERVAL
+                print >>sys.__stdout__, \
+                   '  zipTest still working, be patient...'
+                sys.__stdout__.flush()
         zipfp.close()
 
     def testStored(self):