Don't try to regen info file; our makeinfo is too old.

Index: Makefile.in
--- Makefile.in.orig
+++ Makefile.in
@@ -5706,7 +5706,7 @@ check-am: all-am
 	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
 check: $(BUILT_SOURCES)
 	$(MAKE) $(AM_MAKEFLAGS) check-recursive
-all-am: Makefile $(INFO_DEPS) $(PROGRAMS) $(LIBRARIES) $(MANS) $(DATA) \
+all-am: Makefile $(PROGRAMS) $(LIBRARIES) $(MANS) $(DATA) \
 		$(HEADERS) config.h
 installdirs: installdirs-recursive
 installdirs-am:
@@ -5963,7 +5963,7 @@ install-html-am: $(HTMLS)
 	done; }
 install-info: install-info-recursive
 
-install-info-am: $(INFO_DEPS)
+install-info-am:
 	@$(NORMAL_INSTALL)
 	@srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`; \
 	list='$(INFO_DEPS)'; test -n "$(infodir)" || list=; \