Fix typo: SYSDIG_LICENSE_FILE -> SYSDIG_LICENSE_FILES added by commitea86757e51Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com> Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr> (cherry picked from commitf336ba8c9b) Signed-off-by: Peter Korsgaard <peter@korsgaard.com>