added cmake check for build-arm.sh

util/build-arm.sh

@@ -7,6 +7,12 @@
 
 set -eu -o pipefail
 
+# Check if cmake, a new dependency for randomx support, is installed on system and exits if it is not
+if ! [ -x "$(command -v cmake)" ]; then
+  echo 'Error: cmake is not installed. Install cmake and try again.' >&2
+  exit 1
+fi
+
 cat <<'EOF'
  .~~~~~~~~~~~~~~~~.
 {{ Building Hush!! }}