The pedant in me wishes to see all extraneous trailing / go away.

So, if we are in the top-level makefile, don't add an extra trailing
slash to srcdir, builddir, or VPATH.  It's annoying.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94701 13f79535-47bb-0310-9956-ffa450edef68