get closer to having apxs work from a binary distribution

we need to copy libtool and instdso.sh verbatim, and we
need to edit config_vars.mk and apxs

still broken: "httpd -l" as invoked by apxs can fail since
support libraries (apr, aprutil, etc.) are probably not
findable


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94817 13f79535-47bb-0310-9956-ffa450edef68