Bug#902493: apache2-bin: Event MPM listener thread may get blocked by SSL shutdowns

[Stefan Fritsch]

Between 2.4.25 and the fix for this issue, there were some intrusive 
changes in mpm_evnt. If we did a backport, rhe risk of introducing 
regressions would be quite high. Therefore, and because the next Debian 
stable release is quite near, I don't think it makes sense to backport the 
fix.