Axe writev(2) support from the SSL I/O layer because in Apache 2.0 we no

longer handle the bottom line of I/O ourself. Additionally this again
simplifies mod_ssl's I/O part for later transition to mod_tls's approach
with buckets.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89019 13f79535-47bb-0310-9956-ffa450edef68