axe code to print "-D MULTITHREAD" for apache -V; MULTITHREAD

is a 1.3 hangover;
exit with a log message if ap_create_context() fails when
creating the initial context; otherwise, we SIGSEGV later


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@84822 13f79535-47bb-0310-9956-ffa450edef68