patch 8.2.0140: CI does not test building doc tags

Problem:    CI does not test building doc tags.
Solution:   Add the vimtags/gcc build. Cleanup showing version. (Ozaki Kiichi,
            closes #5513)
diff --git a/runtime/doc/Makefile b/runtime/doc/Makefile
index e10415f..514a012 100644
--- a/runtime/doc/Makefile
+++ b/runtime/doc/Makefile
@@ -323,10 +323,7 @@
 # Use Vim to generate the tags file.  Can only be used when Vim has been
 # compiled and installed.  Supports multiple languages.
 vimtags: $(DOCS)
-	@if command -v $(VIMEXE); then \
-	    $(VIMEXE) --clean -eX -u doctags.vim >/dev/null && \
-	      echo "help tags updated"; \
-	  else echo "vim executable $(VIMEXE) not found; help tags not updated"; fi
+	@$(VIMEXE) --clean -esX -V1 -u doctags.vim
 
 # Use "doctags" to generate the tags file.  Only works for English!
 tags: doctags $(DOCS)