gettext.m4 bug/maybe fix

[Vaclav Haisman]

Hi,
the test in gettext.m4 always fails when used with C++ compiler because 
there is declaration of const char *_nl_expand_alias (); and later it is 
used with 0 as int argument which is of course error because the declaration 
clearly says that it takes no arguments. The obvious patch is to change the 
declaration when used with C++ compiler and that is exactly what the 
attached patch does.

Vaclav Haisman

gettext.m4.diff
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