Support gettext >= 0.20, which now forbids AM_GNU_GETTEXT without
intlsymbol argument.

[no-libtool] was the default choice (use of intl/ in-package
directory).

Now only [external] is supported (use libintl library).
--
diff -up e2fsprogs-1.45.2/configure.ac.orig e2fsprogs-1.45.2/configure.ac
--- e2fsprogs-1.45.2/configure.ac.orig
+++ e2fsprogs-1.45.2/configure.ac
@@ -873,7 +873,7 @@ AC_SUBST(GETTEXT_PACKAGE)
 AC_SUBST(PACKAGE)
 AC_SUBST(VERSION)
 
-AM_GNU_GETTEXT
+AM_GNU_GETTEXT([external])
 dnl
 dnl End of configuration options
 dnl