allow changing install path from cmake-gui
allow changing install path from cmake-gui

jlblancoc/suitesparse-metis-for-windows,jlblancoc/suitesparse-metis-for-windows,jlblancoc/suitesparse-metis-for-windows,jlblancoc/suitesparse-metis-for-windows,jlblancoc/suitesparse-metis-for-windows,jlblancoc/suitesparse-metis-for-windows,jlblancoc/suitesparse-metis-for-windows,jlblancoc/suitesparse-metis-for-windows,jlblancoc/suitesparse-metis-for-windows