- add patch [libcaca-autoconf-2.69.patch]
* Don't force autoconf to be at version 2.71

- Upgrade to 0.99.beta20
* IPv6 support in cacaserver
* fixed a bug from 2004 that caused PDF documentation generation to fail
* memory allocation functions are now more robust
* numerous fixes for memory leaks and invalid memory accesses:
* CVE-2021-30498
* CVE-2021-30499
* CVE-2021-3410
* CVE-2018-20546
* CVE-2018-20547
* CVE-2018-20545
* CVE-2018-20548
* CVE-2018-20549
- Dropped upstream fixed patches
* libcaca-bsc1182731-prevent-overflow.patch
* libcaca-variable-type.patch
* Bug1120502-add_cast_to_prevent_overflow.patch