[loader] external zbic + code tweaks (#4484)

- [x] I have read and followed the [Contribution Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CONTRIBUTING.md#code-contributions).
- [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md)
- [x] I have read and followed the [Coding Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/Coding.md) to the best of my ability.

-------------------

zstd repo changed from atmosphere to kinnay's

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4484

cpmfile.json

@@ -338,6 +338,11 @@
         "repo": "herumi/xbyak",
         "version": "v7.40.1"
     },
+    "zbic": {
+        "hash": "fbe2f37986377d7f0d96ae3224c80b5971df6e8b6961f68061f1975ebb2e8cb78f07b90f014b007be4023dbf5513581504e7f7d61a5237cb2a8a7a61ae11e482",
+        "repo": "kinnay/zbic",
+        "version": "11b08f2712264bbed731545085cbd9702096ceb7"
+    },
     "zlib": {
         "hash": "16fea4df307a68cf0035858abe2fd550250618a97590e202037acd18a666f57afc10f8836cbbd472d54a0e76539d0e558cb26f059d53de52ff90634bbf4f47d4",
         "min_version": "1.2",