Changes to reduce dependency on in-tree apr and apr-util.

Changes to reduce dependency on in-tree apr and apr-util.
Change AC_CONFIG_AUX_DIR in configure to build from srclib/apr/build.
Have buildconf copy the needed files (config.guess, config.sub,
PrintPath) from srclib/apr/build to build.
Change binbuild.sh to stop using srclib/apr.

This gets to to where ./configure --with-apr --with-apr-util actually
works without an in-tree apr and apr-util, though we still need them
in-tree to run buildconf.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@97671 13f79535-47bb-0310-9956-ffa450edef68