Update install-opencv.sh
Update install-opencv.sh

use make -j($(nproc)) instead of make -j4 to use all cpu
milq/installation-scripts,milq/code,milq/scripts-for-ubuntu-debian,milq/milq,milq/scripts-ubuntu-debian,milq/milq,milq/code,milq/milq,milq/scripts-ubuntu-debian,milq/scripts-ubuntu-debian,milq/code,milq/milq,milq/code,milq/installation-scripts,milq/installation-scripts,milq/milq,milq/milq,milq/installation-scripts,milq/installation-scripts,milq/installation-scripts,milq/installation-scripts,milq/milq,milq/code,milq/milq,milq/scripts-ubuntu-debian,milq/installation-scripts