xgettext 0.15 diagnostic prints wrong file name, line number

[Paul Eggert]

I ran into this minor problem when bootstrapping GNU tar with gettext
0.15.  This is on Debian stable, where I've built gettext myself.
Here are the symptoms:

   $ cat t.c
   char const x[] = N_("\v");
   $ xgettext --keyword=N_ t.c
   ../../../gettext-0.15/gettext-tools/src/xgettext.c:2038: internationalized 
messages should not contain the `\v' escape sequence

The first part of that diagnostic should say "t.c:1" rather than refer
to the gettext source.