[cmake] cache the output of lsb_release, as it might take very long
[cmake] cache the output of lsb_release, as it might take very long
chr-engwer/Vc,chr-engwer/Vc,chr-engwer/Vc,VcDevel/Vc,VcDevel/Vc,VcDevel/Vc,VcDevel/Vc