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3 changes:
 1) reject Perl older than 5.004
 2) use built-in constants for SOCK_STREAM AF_UNIX
 3) use sockaddr_un() for filenames passed to bind/connect
     - a fix found by Luuk de Boer <luuk_de_boer@pi.net>  for Linux problems


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80946 13f79535-47bb-0310-9956-ffa450edef68