resource: fix GCC build

src/resource/unit_resource.cpp

@@ -4,6 +4,7 @@
  */
 
 #include "core/containers/array.h"
+#include "core/containers/hash_map.h"
 #include "core/filesystem/file.h"
 #include "core/filesystem/filesystem.h"
 #include "core/memory/allocator.h"