add strndup replacement function for systems which lack it

README

@@ -5,7 +5,7 @@
 |_|___/\__, |_| |_|\___|
        |___/            
 isync - IMAP4 to maildir mailbox synchronization program
-http://www.sigpipe.org/isync/
+http://www.sigpipe.org:8080/isync/
 
 Author: Michael Elkins <me@mutt.org>
 

configure.in

@@ -11,6 +11,7 @@ AC_ARG_WITH(ssl-dir, [  --with-ssl-dir=DIR	location where openssl is insalled],
 	else
 		AC_MSG_ERROR(can't find OpenSSL in $withval)
 	fi])
+AC_REPLACE_FUNCS(strndup)
 AC_CHECK_FUNCS(getopt_long)
 AC_CHECK_LIB(socket,socket)
 AC_CHECK_LIB(nsl,inet_ntoa)