Fix $AWK/awk usage in top-level configure script: We confused ourself and

replaced the wrong "$AWK" with a plain "awk" in the last releases. So we now
both fix this and move the comment which already tried to explain it more
closer to the location to which it applies.

Submitted by: Paul Gilmartin <pg@sweng.stortek.com>
Extended and reviewed by: Ralf S. Engelschall
PR: 5304


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@84167 13f79535-47bb-0310-9956-ffa450edef68