Faulty version check in foreign_key_info

The version check in foreign_key_info fails to check the minor version. 
The fix is easy, though:

--- a/lib/DBD/mysql.pm
+++ b/lib/DBD/mysql.pm
 <at>  <at>  -638,7 +638,7  <at>  <at>  sub foreign_key_info {

      # INFORMATION_SCHEMA.KEY_COLUMN_USAGE was added in 5.0.6
      my ($maj, $min, $point) = _version($dbh);
-    return if $maj < 5 || ($maj == 5 && $point < 6);
+    return if $maj < 5 || ($maj == 5 && $min == 0 && $point < 6);

      my $sql = <<'EOF';
  SELECT NULL AS PKTABLE_CAT,

--

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