fix error when decompress opencv for jetson

deploy/cpp/scripts/jetson_bootstrap.sh

@@ -4,7 +4,7 @@ if [ ! -d "./deps/opencv3" ]; then
     mkdir -p deps
     cd deps
     wget -c ${OPENCV_URL}
-    tar xvfj opencv3_aarch.tgz
+    tar xvfz opencv3_aarch.tgz
     rm -rf opencv3_aarch.tgz
     cd ..
 fi