patch 9.1.0696: installing runtime files fails when using SHADOWDIR

Problem:  installing runtime files fails when using SHADOWDIR
Solution: revert part of v9.1.0609, since runtime/doc/Makefile's default
          value for VIMPROG does not work if vim was built in a SHADOWDIR.
          (James McCoy)

closes: #15575

Signed-off-by: James McCoy <jamessan@jamessan.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/Makefile

@@ -2354,8 +2354,8 @@ installrtbase: $(HELPSOURCE)/vim.1 $(DEST_VIM) $(VIMTARGET) $(DEST_RT) \
 	cd $(HELPSOURCE); if test -z "$(CROSS_COMPILING)" -a -f tags; then \
 		mv -f tags tags.dist; fi
 	@echo generating help tags
-	-@cd $(HELPSOURCE); if test -z "$(CROSS_COMPILING)"; then \
-		$(MAKE) vimtags; fi
+	-@BUILD_DIR=`pwd`; cd $(HELPSOURCE); if test -z "$(CROSS_COMPILING)"; then \
+		$(MAKE) VIMPROG="$$BUILD_DIR/$(VIMTARGET)" vimtags; fi
 	cd $(HELPSOURCE); \
 		files=`ls *.txt tags`; \
 		files="$$files `ls *.??x tags-?? 2>/dev/null || true`"; \

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    696,
 /**/
     695,
 /**/