project-template: use lib install dir defined by GNUInstallDirs
this should fix library search problems on Tumbleweed
project-template installs cmake-config files to library destination
note, individual projects also need to be changed, for installation of actual libs
this should fix library search problems on Tumbleweed project-template installs cmake-config files to library destination note, individual projects also need to be changed, for installation of actual libs