scmutil: fix NameError on windows

Forgot to import util in mercurial.scmwindows. Error was introduced in:

changeset:   18862:4c6f7f0dadab
user:        Kevin Bullock <[e-mail]>
date:        Tue Feb 12 11:36:21 2013 -0600
summary:     scmutil: split platform-specific bits into their own modules

mercurial/scmwindows.py

@@ -1,45 +1,46 b''
 import os
 import osutil
+import util
 import _winreg
 
 def systemrcpath():
     '''return default os-specific hgrc search path'''
     rcpath = []
     filename = util.executablepath()
     # Use mercurial.ini found in directory with hg.exe
     progrc = os.path.join(os.path.dirname(filename), 'mercurial.ini')
     if os.path.isfile(progrc):
         rcpath.append(progrc)
         return rcpath
     # Use hgrc.d found in directory with hg.exe
     progrcd = os.path.join(os.path.dirname(filename), 'hgrc.d')
     if os.path.isdir(progrcd):
         for f, kind in osutil.listdir(progrcd):
             if f.endswith('.rc'):
                 rcpath.append(os.path.join(progrcd, f))
         return rcpath
     # else look for a system rcpath in the registry
     value = util.lookupreg('SOFTWARE\\Mercurial', None,
                            _winreg.HKEY_LOCAL_MACHINE)
     if not isinstance(value, str) or not value:
         return rcpath
     value = util.localpath(value)
     for p in value.split(os.pathsep):
         if p.lower().endswith('mercurial.ini'):
             rcpath.append(p)
         elif os.path.isdir(p):
             for f, kind in osutil.listdir(p):
                 if f.endswith('.rc'):
                     rcpath.append(os.path.join(p, f))
     return rcpath
 
 def userrcpath():
     '''return os-specific hgrc search path to the user dir'''
     home = os.path.expanduser('~')
     path = [os.path.join(home, 'mercurial.ini'),
             os.path.join(home, '.hgrc')]
     userprofile = os.environ.get('USERPROFILE')
     if userprofile:
         path.append(os.path.join(userprofile, 'mercurial.ini'))
         path.append(os.path.join(userprofile, '.hgrc'))
     return path