fix: Fix build on armv6/armv7 (#6123)

code/AssetLib/MDL/MDLFileData.h

@@ -602,7 +602,7 @@ struct Vertex_MDL7
     union {
         uint8_t norm162index;
         float norm[3];
-    };
+    } PACK_STRUCT;
 } PACK_STRUCT;
 
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