HTTP: ignore "Content-Encoding: compress"

Currently, libcurl rejects responses with "Content-Encoding: compress"
when CURLOPT_ACCEPT_ENCODING is set to "". I think that libcurl should
treat the Content-Encoding "compress" the same as other
Content-Encodings that it does not support, e.g. "bzip2". That means
just ignoring it.

lib/transfer.c

@@ -756,7 +756,6 @@ static CURLcode readwrite_data(struct SessionHandle *data,
               result = Curl_unencode_gzip_write(conn, k, nread);
             break;
 
-          case COMPRESS:
           default:
             failf (data, "Unrecognized content encoding type. "
                    "libcurl understands `identity', `deflate' and `gzip' "