gengenrtl needs to link with libintl

[DJ Delorie]

> Zack sent a patch to mkconfig.sh to turn off HAVE_LIBINTL_H when
> building generator files.  I am currently testing it.  It could just
> as easily undefine ENABLE_NLS.

Ok, let me know how it goes.

> As noted an later email, glibc also adds ENABLE_NLS to getopt.c and
> obstack.c.  So, it would be great if you could merge these as well.

I'll try to find time to do that, but unfortunately those files have
diverged from the glibc versions so it's not a simple merge.  If
someone else wants to step in and help, it'd be appreciated.