aot compiler: Enlarge AOTNativeSymbol->symbol (#3662)

The old value was not enough for wasm_externref_obj_to_internal_obj,
which is 34 characters long.

core/iwasm/compilation/aot.h

@@ -300,7 +300,7 @@ typedef struct AOTCompData {
 
 typedef struct AOTNativeSymbol {
     bh_list_link link;
-    char symbol[32];
+    char symbol[48];
     int32 index;
 } AOTNativeSymbol;