fix a problem where a crash of a non-MPM child process could

result in an error log message stating that the parent had
crashed

the problem, which affected all *X platforms, was due to an
attempt to support the general problem with linuxthreads;
this change leaves us with a relatively obscure hole when
running on linuxthreads (see comments)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@102033 13f79535-47bb-0310-9956-ffa450edef68