[Distutils] patch to utils.py for Windows os.path.isdir glitch

[Fred Yankowski]

I was finally able to install the distutils 0.1 package on my Windows
NT machine running Python 1.5.2, after getting around two problems:

1) I had a very old python.exe sitting in my PATH, which when run
   would report itself as Python version 1.5.2 but would cause
   sys.prefix and sys.exec_prefix to be empty because Python couldn't
   find the expected libraries relative to the python.exe location.  I
   deleted that old python.exe and now sys.prefix and sys.exec_prefix
   are set correctly.  Thanks to Mark Hammond for suggesting the fix.

2) Running 'python -v start.py install' would result in an exception
   in utils.py when os.mkdir() would be called on an existing
   directory.  It seems that on Windows, os.path.isdir() does not
   accept trailing backslashes on a directory name.  For example,
   os.path.isdir('c:\\progra~1') returns 1 on my machine, but
   os.path.isdir('c:\\progra~1\\') returns 0.  I tweaked utils.py to
   account for that and now the installation seems to finish OK.  I
   have attached the patch with my suggested change.

-- 
Fred Yankowski           fred@OntoSys.com      tel: +1.630.879.1312
Principal Consultant     www.OntoSys.com       fax: +1.630.879.1370
OntoSys, Inc             38W242 Deerpath Rd, Batavia, IL 60510, USA

--
===================================================================
RCS file: RCS/util.py
retrieving revision 1.1
retrieving revision 1.2
diff -c -r1.1 -r1.2
*** util.py   1999/10/22 18:32:41	1.1
--- util.py   1999/10/22 19:35:03	1.2
***************
*** 37,50 ****
      # the creation of the whole path? (quite easy to do the latter since
      # we're not using a recursive algorithm)
  
      if os.path.isdir (name):
          return
      if PATH_CREATED.get (name):
          return
  
      (head, tail) = os.path.split (name)
-     if not tail:                        # in case 'name' has trailing slash
-         (head, tail) = os.path.split (head)
      tails = [tail]                      # stack of lone dirs to create
      
      while head and tail and not os.path.isdir (head):
--- 37,52 ----
      # the creation of the whole path? (quite easy to do the latter since
      # we're not using a recursive algorithm)
  
+     (head, tail) = os.path.split (name)
+     if not tail:                        # in case 'name' has trailing slash
+         name = head
+ 
      if os.path.isdir (name):
          return
      if PATH_CREATED.get (name):
          return
  
      (head, tail) = os.path.split (name)
      tails = [tail]                      # stack of lone dirs to create
      
      while head and tail and not os.path.isdir (head):