Un-break the test and untie serving code in dash example

src/fs_packed.c

@@ -7,6 +7,9 @@ struct packed_file {
   size_t pos;
 };
 
+const char *mg_unpack(const char *path, size_t *size, time_t *mtime);
+const char *mg_unlist(size_t no);
+
 #if MG_ENABLE_PACKED_FS
 #else
 const char *mg_unpack(const char *path, size_t *size, time_t *mtime) {