Fix typo in ./config.

Submitted by: Sander Temme

config

@@ -540,7 +540,7 @@ case "$GUESSOS" in
 	ISA64=`(sysctl -n hw.optional.x86_64) 2>/dev/null`
 	if [ "$ISA64" = "1" ]; then
 	    echo "WARNING! If you wish to build 64-bit library, then you have to"
-	    echo "         invoke './Configure darwin64-x86_86-cc' *manually*."
+	    echo "         invoke './Configure darwin64-x86_64-cc' *manually*."
 	    if [ "$TEST" = "false" -a -t 1 ]; then
 	      echo "         You have about 5 seconds to press Ctrl-C to abort."
 	      (trap "stty `stty -g`" 2 0; stty -icanon min 0 time 50; read waste) <&1