bug#17056: dfa.c patch for systems with no locale support

[Paul Eggert]

On 03/27/2014 11:48 AM, Aharon Robbins wrote:
What if
the system's setlocale() actually returns NULL?
Then we don't know what the locale is.  Perhaps setlocale ran out of 
memory and so returned NULL.  If so, subsequent calls might use some 
weird Turkish locale with multibyte characters.  So it sounds safer to 
assume the worst in that case.