added duf and nginx and some refactor

scripts/build_image.sh

@@ -23,6 +23,8 @@
 . ./scripts/lrzsz.sh
 . ./scripts/tcc.sh
 . ./scripts/zlib.sh
+. ./scripts/nginx.sh
+. ./scripts/duf_bin.sh
 
 case $1 in
     build)
@@ -92,6 +94,12 @@ case $1 in
     zlib)
         zlib
         ;;
+    nginx)
+        nginx_build
+        ;;
+    duf_bin)
+        duf_bin
+        ;;
     *)
         printf "$UYELLOW** $0 script using: $0 {clean|build|download|rootfs}\n$RESET"
         exit 1