Limit recursion in ap_expr evaluation to avoid unbounded stack usage
* evaluate chains of ||, &&, and string concatenation non-recursively * limit other types of recursion to 20 levels * avoid some string copies if concatenating more than 2 strings git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1204087 13f79535-47bb-0310-9956-ffa450edef68
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