On HPUX 11.x, the 'ENOBUFS, No buffer space available'

On HPUX 11.x, the 'ENOBUFS, No buffer space available'
error occures because the accept() cannot complete.
You will not see ENOBUFS at 10.20 because the kernel
hides any occurrence from being returned from user space.
ENOBUFS at 11.0 TCP/IP is quite possible, and could
occur intermittently. As a work-around, we are going to
ingnore ENOBUFS.

Submitted by: madhusudan_mathihalli@hp.com
Reviewed by: Bill Stoddard

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92894 13f79535-47bb-0310-9956-ffa450edef68