Fix CI failures

Set of changes to fix some issue on CI

• add missing author in AUTHOR file;
• fix wsaccel library installation;
• add missing package for CentOS;
• ignore false leak;
• ignore warning from newer Gstreamer includes;
• remove wrong OpeenSSL configuration to make Windows tests work.

As minor:

• update Autoconf script syntax;
• use OpenSSL call to TLS_method.

See https://gitlab.freedesktop.org/fziglio/spice/-/pipelines/877542.