.gitignore: ignore more scripts/config output

dcf3e63a35 added a newer kconfig version which produces a bit more local
code output, add that output to the ignore list

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>

.gitignore

@@ -16,6 +16,10 @@
 /overlay
 /package/feeds
 /package/openwrt-packages
+scripts/config/mconf_check
+scripts/config/zconf.hash.c
+scripts/config/zconf.lex.c
+scripts/config/zconf.tab.c
 /*.patch
 key-build*
 *.orig