patch 7.4.1556
Problem:    "make install" changes the help tags file, causing it to differ
            from the repository.
Solution:   Move it aside and restore it.
diff --git a/src/Makefile b/src/Makefile
index 2b17db5..a52a1f3 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2112,6 +2112,9 @@
 	-$(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); $(MAKE) VIMEXE=$(DEST_BIN)/$(VIMTARGET) vimtags
 	cd $(HELPSOURCE); \
 		files=`ls *.txt tags`; \
@@ -2121,6 +2124,7 @@
 		chmod $(HELPMOD) $$files
 	$(INSTALL_DATA)  $(HELPSOURCE)/*.pl $(DEST_HELP)
 	chmod $(SCRIPTMOD) $(DEST_HELP)/*.pl
+	cd $(HELPSOURCE); mv -f tags.dist tags
 # install the menu files
 	$(INSTALL_DATA) $(SCRIPTSOURCE)/menu.vim $(SYS_MENU_FILE)
 	chmod $(VIMSCRIPTMOD) $(SYS_MENU_FILE)
diff --git a/src/version.c b/src/version.c
index 38d89c1..9c15aaf 100644
--- a/src/version.c
+++ b/src/version.c
@@ -744,6 +744,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1556,
+/**/
     1555,
 /**/
     1554,