Restore OS -> TARGET map

scripts/solana-install-deploy.sh

@@ -18,6 +18,21 @@ if [[ ! -f update_manifest_keypair.json ]]; then
   "$SOLANA_ROOT"/scripts/solana-install-update-manifest-keypair.sh "$OS"
 fi
 
+case "$OS" in
+osx)
+  TARGET=x86_64-apple-darwin
+  ;;
+linux)
+  TARGET=x86_64-unknown-linux-gnu
+  ;;
+windows)
+  TARGET=x86_64-pc-windows-msvc
+  ;;
+*)
+  TARGET=unknown-unknown-unknown
+  ;;
+esac
+
 case $URL in
 edge|beta)
   URL=http://$URL.testnet.solana.com:8899