Merge topic 'cpack-rpm-pre-semicolon' into release-3.21

3cdf2398 CPackRPM: avoid a spurious `;` in the `%pre` and other sections with scripts

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Ben Boeckel <ben.boeckel@kitware.com>
Merge-request: !6415