make sure `gitman.info' isn't produced since it's broken (duplicate
node names).

diff --git a/Documentation/Makefile b/Documentation/Makefile
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -84,7 +84,7 @@ man1: $(DOC_MAN1)
 man5: $(DOC_MAN5)
 man7: $(DOC_MAN7)
 
-info: git.info gitman.info
+info: git.info
 
 install: man
 	$(INSTALL) -d -m 755 $(DESTDIR)$(man1dir)
@@ -96,10 +96,9 @@ install: man
 
 install-info: info
 	$(INSTALL) -d -m 755 $(DESTDIR)$(infodir)
-	$(INSTALL) -m 644 git.info gitman.info $(DESTDIR)$(infodir)
+	$(INSTALL) -m 644 git.info $(DESTDIR)$(infodir)
 	if test -r $(DESTDIR)$(infodir)/dir; then \
 	  $(INSTALL_INFO) --info-dir=$(DESTDIR)$(infodir) git.info ;\
-	  $(INSTALL_INFO) --info-dir=$(DESTDIR)$(infodir) gitman.info ;\
 	else \
 	  echo "No directory found in $(DESTDIR)$(infodir)" >&2 ; \
 	fi