Remove select checks from Apache config. These checks were used to define

ap_select in ap_config.h.  The only file that used ap_select() was
prefork.c.  I have modified prefork.c to use select instead of ap_select.
In the future, this should be modified to use ap_poll like the rest of the
Unix MPMs.  There are other MPMs that are continuing to use select, but this
too should change in time.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85663 13f79535-47bb-0310-9956-ffa450edef68