Fix the binary build install script so that the build logic

created by "apxs -g" will work when the user has a binary
build.

We didn't copy enough of the build directory and we edited
the wrong version of config_vars.mk.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@95489 13f79535-47bb-0310-9956-ffa450edef68