Message 74500 - Python tracker

zipimport.c seems fine, because stat(2) succeeds for UNC file. It fails
for UNC folder. (zip file is absolutely file)

Already fix for issue1293 was in, so maybe I should create the patch for
that direction but... anyway this issue seems to be fixed by my patch. I
also confirmed the test script in http://bugs.python.org/msg56523 works.