Unbreak objc build – with --enable-maintainer-mode

        * Makefile.in (aclocal_deps): Fix path to cet.m4.

From-SVN: r278732

libobjc/ChangeLog

+2019-11-26  Tobias Burnus  <tobias@codesourcery.com>
+
+	* Makefile.in (aclocal_deps): Fix path to cet.m4.
+
 2019-09-27  Maciej W. Rozycki  <macro@wdc.com>
 
 	* configure: Regenerate.

libobjc/Makefile.in

@@ -297,7 +297,7 @@ aclocal_deps = \
 	$(srcdir)/../ltsugar.m4 \
 	$(srcdir)/../ltversion.m4 \
 	$(srcdir)/../lt~obsolete.m4 \
-	$(srcdir)/../cet.m4 \
+	$(srcdir)/../config/cet.m4 \
 	$(srcdir)/acinclude.m4
 
 $(srcdir)/configure: @MAINT@ configure.ac $(srcdir)/aclocal.m4