Initialize SUFFIXES and CLEANFILES since the makefile snippet from localcharset uses '+=' on them.

lib/Makefile.tmpl

@@ -50,5 +50,7 @@ $(srcdir)/getdate.c: getdate.y
 	  $(YACC) $(YFLAGS) getdate.y && \
 	  mv -f y.tab.c getdate.c
 
+SUFFIXES = .o .c .h
+CLEANFILES = 
 # gnulib modules