patch 7.4.1633

Problem:    If the help tags file was removed "make install" fails. (Tony
            Mechelynck)
Solution:   Only try moving the file if it exists.

src/Makefile

@@ -2115,11 +2115,11 @@ installrtbase: $(HELPSOURCE)/vim.1 $(DEST_VIM) $(DEST_RT) \
 		$(DEST_FTP) $(DEST_AUTO) $(DEST_AUTO)/xml $(DEST_PLUG) \
 		$(DEST_TUTOR) $(DEST_SPELL) $(DEST_COMP)
 	-$(SHELL) ./installman.sh install $(DEST_MAN) "" $(INSTALLMANARGS)
-	@echo generating help tags
 # Generate the help tags with ":helptags" to handle all languages.
 # Move the distributed tags file aside and restore it, to avoid it being
 # different from the repository.
-	cd $(HELPSOURCE); mv -f tags tags.dist
+	cd $(HELPSOURCE); if test -f tags; then mv -f tags tags.dist; fi
+	@echo generating help tags
 	-@cd $(HELPSOURCE); $(MAKE) VIMEXE=$(DEST_BIN)/$(VIMTARGET) vimtags
 	cd $(HELPSOURCE); \
 		files=`ls *.txt tags`; \
@@ -2129,7 +2129,7 @@ installrtbase: $(HELPSOURCE)/vim.1 $(DEST_VIM) $(DEST_RT) \
 		chmod $(HELPMOD) $$files
 	$(INSTALL_DATA)  $(HELPSOURCE)/*.pl $(DEST_HELP)
 	chmod $(SCRIPTMOD) $(DEST_HELP)/*.pl
-	cd $(HELPSOURCE); mv -f tags.dist tags
+	cd $(HELPSOURCE); if test -f tags.dist; then mv -f tags.dist tags; fi
 # install the menu files
 	$(INSTALL_DATA) $(SCRIPTSOURCE)/menu.vim $(SYS_MENU_FILE)
 	chmod $(VIMSCRIPTMOD) $(SYS_MENU_FILE)

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1633,
 /**/
     1632,
 /**/