Fix "Ouch! Freeing free block" error. Beef up sigsegv/bus handler to also

deal with sigabort/sigabrt and not get into an infinite loop.

Reviewed by:	Rob Hartill


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79328 13f79535-47bb-0310-9956-ffa450edef68