tags: link from CONFIG_x to 'config x' as well

diff -puN Makefile~tags-link-from-config_x-to-config-x-as-well Makefile
@@ -1482,6 +1482,10 @@ define xtags
 		--langdef=kconfig \
 		--language-force=kconfig \
 		--regex-kconfig='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/\2/'; \
+	    $(all-kconfigs) | xargs $1 -a \
+		--langdef=kconfig \
+		--language-force=kconfig \
+		--regex-kconfig='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/CONFIG_\2/'; \
 	    $(all-defconfigs) | xargs -r $1 -a \
 		--langdef=dotconfig \
 		--language-force=dotconfig \

@@ -1490,6 +1494,8 @@ define xtags
 	    $(all-sources) | xargs $1 -a; \
 	    $(all-kconfigs) | xargs $1 -a \
 		--regex='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/\3/'; \
+	    $(all-kconfigs) | xargs $1 -a \
+		--regex='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/CONFIG_\3/'; \
 	    $(all-defconfigs) | xargs -r $1 -a \
 		--regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
 	else \