Remove all instances of apache_apr_flags="--enable-threads" from the

config.m4 files.  If we leave those in, then Apache automatically
enables threads for all machines when a threaded MPM is chosen.  We want
people to have to force threads for platforms that don't run threads
well (i.e. FreeBSD).


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88185 13f79535-47bb-0310-9956-ffa450edef68