[Bug #3560] empty LC_ALL is correct

[Jonathan Ernst]

Fixes bug #3560 (http://bugs.winehq.org/show_bug.cgi?id=3560)

Changelog: 
- if LC_ALL is empty (not null but equal to ''), then LANG should be used


>From man locale:
       LANG   Provide a default value for the  internationalization  variables
              that  are  unset  or  null.  (See the Base Definitions volume of
              IEEE Std 1003.1-2001, Section  8.2,  Internationalization  Vari-
              ables  for the precedence of internationalization variables used
              to determine the values of locale categories.)

       LC_ALL If set to a non-empty string value, override the values  of  all
              the other internationalization variables.
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