cmake: qi_install_header fix: KEEP_RELATIVE_PATHS was no longer working
cmake: qi_install_header fix: KEEP_RELATIVE_PATHS was no longer working

dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild