Consequently write shell variables as "${name}" instead of "$name", especially

to avoid problems in some brain-dead Bourne-shell variants when something like
"$conf-dist" is used which now is written more safe as "${conf}-dist".


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@81112 13f79535-47bb-0310-9956-ffa450edef68