normalize newlines in forms to CRLF

HTTP::Message < 7.00 normalized newlines in requests to CRLF. This has
been removed. Based on the [HTML
spec](https://html.spec.whatwg.org/#converting-an-entry-list-to-a-list-of-name-value-pairs)
and [URL spec](https://url.spec.whatwg.org/#urlencoded-serializing), the CRLF
normalization should be in the HTML layer. So the change in
HTTP::Message is correct, and HTML::Form should be handling the
normalization.

Add normalization of lone \r or \n into \r\n, as defined in the HTML
spec.

Author: haarg

lib/HTML/Form/Input.pm

@@ -113,6 +113,8 @@ sub form_name_value {
     return if $self->disabled;
     my $value = $self->value;
     return unless defined $value;
+    s/\x0d?\x0a|\x0d/\x0d\x0a/g
+      for $name, $value;
     return ( $name => $value );
 }