make shared libraries executable so they work on HP-UX

(I'm not sure that this logic for copying DSOs will survive
in the libtool scheme; I'm putting this 1.3 fix in just in
case.)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@91675 13f79535-47bb-0310-9956-ffa450edef68