Fix an exception raised when trying to gclient sync on a Mac

Fix an exception raised when trying to gclient sync on a Mac
with python 2.5.1.

Traceback (most recent call last):
  File "/Users/tc/depot_tools/gclient.py", line 1270, in <module>
    fix_encoding.fix_encoding()
  File "/Users/tc/depot_tools/fix_encoding.py", line 350, in fix_encoding
    ret &= fix_default_encoding()
  File "/Users/tc/depot_tools/fix_encoding.py", line 51, in
fix_default_encoding
    lang = locale.getlocale(aref)[0]
  File
"/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/locale.py",
line 460, in getlocale
    return _parse_localename(localename)
  File
"/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/locale.py",
line 373, in _parse_localename
    raise ValueError, 'unknown locale: %s' % localename
ValueError: unknown locale: C/UTF-8/C/C/C/C

R=dpranke@chromium.org,chase@chromium.org,bradnelson@google.com,maruel@chromium.org,evan@chromium.org,nsylvain@chromium.org,nsylvain@google.com
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=79213

[M-A Ruel, 2011-03-23 23:12:47]

lgtm, thanks