fix: settle a core file only by its size or slot

install/retrobat.json

@@ -241,10 +241,10 @@
       }
     }
   ],
-  "total_files": 12397,
-  "total_size": 8504485005,
-  "pack_files": 12399,
-  "pack_size": 8504485005,
+  "total_files": 12398,
+  "total_size": 8504485261,
+  "pack_files": 12400,
+  "pack_size": 8504485261,
   "total_omitted": 30,
   "omitted_files": [
     {
@@ -61418,6 +61418,16 @@
         "genesis_plus_gx"
       ]
     },
+    {
+      "dest": "c600.rom",
+      "sha1": "d4181c9f046aafc3fb326b381baac809d9e38d16",
+      "sha256": "de1e3e035878bab43d0af8fe38f5839c527e9548647036598ee6fe7ec74d2a7d",
+      "size": 256,
+      "repo_path": "bios/Apple/Apple II/AppleIIe_DiskII.rom",
+      "cores": [
+        "gsplus"
+      ]
+    },
     {
       "dest": "gzdoom.pk3",
       "sha1": "810ed9968c5b3bdc2c348c9bc76e9f80fbe31308",