trousers: security fixes
Fixes for the following CVEs, plus a fix for an annocheck warning.
- Fix for CVE-2020-24330 (RHBZ#1874824)
- Fix for CVE-2020-24331 (RHBZ#1870057)
- Fix for CVE-2020-24332 (RHBZ#1870053)
Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com>