nginx: cleaned code to activate some non-default modules

network/nginx/nginx.conf

@@ -47,8 +47,6 @@ if pkginstalled openssl; then
 fi
 
 # add some optional modules not built by default
-var_append confopt ' ' "--with-http_stub_status_module"
-var_append confopt ' ' "--with-http_flv_module"
-var_append confopt ' ' "--with-http_realip_module"
-var_append confopt ' ' "--with-http_gzip_static_module"
-var_append confopt ' ' "--with-http_image_filter_module"
+for x in stub_status flv realip gzip_static image_filter; do
+	var_append confopt ' ' "--with-http_${x}_module"
+done