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

scripts/net.sh

@@ -76,3 +76,9 @@ fetch_network() {
 
 fetch_network EvalFileDefaultName
 
+if [ "$1" = "0" ]; then
+    DUMP_FILE=universal/network_dump.inc
+    echo -n '"' > $DUMP_FILE
+    hexdump -v -e '"\\" "x" 1/1 "%02X"' "$(get_nnue_filename EvalFileDefaultName)" >> $DUMP_FILE
+    echo -n '"' >> $DUMP_FILE
+fi