get threaded.c to compile on non-AIX systems which have sys/processor.h

if we want to call bindprocessor(), we should check for bindprocessor(),
not some header file

(prefork and perchild to be fixed shortly)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89351 13f79535-47bb-0310-9956-ffa450edef68