Add checking for rsync dependency

bedrock-linux-99.99.99-x86_64.sh

@@ -27,6 +27,7 @@ else
 		exit_success
 	fi
 fi
+if brl which rsync 2>&1 > /dev/null; then
 	make SKIPSIGN=true -j $(nproc) BEDROCK_VERSION="${newest_version}"
 	/bedrock/libexec/busybox sh "bedrock-linux-${newest_version}-$(uname -m).sh" --force-update
 	echo "Syncing to disk..."
@@ -34,3 +35,6 @@ sync
 	#echo "If there were no errors up to this point, then everything has gone smoothly. Ignore any following errors!"
 	echo "Done!"
 	exit_success
+else
+	abort "Rsync must be installed!"
+fi