Universal builds for Android armv8 and compatibility with older compilers

- We add a new path for supporting universal builds without #embed . `xxd` causes the compiler to run out of memory, so instead we embed it as a string literal created at compile time.
    - This file is created in `net.sh`, and only if `--embed-dir` isn't supported + we are doing a universal build.
    - This was necessary because Android NDK seems to not support embed, idk why
- A couple other Makefile tweaks were necessary for the Android path.
- While we're at it, remove the non-universal arm64 windows and android binaries.

closes https://github.com/official-stockfish/Stockfish/pull/6827

No functional change

.github/ci/arm_matrix.json

@@ -21,16 +21,10 @@
       "archive_ext": "tar"
     }
   ],
-  "binaries": ["armv8-dotprod", "armv8", "armv7", "armv7-neon"],
+  "binaries": ["armv8-universal", "armv7", "armv7-neon"],
   "exclude": [
     {
-      "binaries": "armv8-dotprod",
-      "config": {
-        "compiler": "armv7a-linux-androideabi29-clang++"
-      }
-    },
-    {
-      "binaries": "armv8",
+      "binaries": "armv8-universal",
       "config": {
         "compiler": "armv7a-linux-androideabi29-clang++"
       }