OpenPGP: revert 4d8b2c12ed

It broke OpenPGP on Yubikey NEOs and maybe other older versions too.

Reverting it restores functionality for those Yubikeys.

src/libopensc/card-openpgp.c

@@ -710,17 +710,6 @@ pgp_get_card_features(sc_card_t *card)
 					pgp_parse_hist_bytes(card, hist_bytes+2, hist_bytes_len-2);
 				}
 				break;
-			default:
-				/* Something else is non-standard according to
-				 * ISO7816-4 section 8 - Historical bytes,
-				 * but used by Yubico, which should have all
-				 * the needed capabilities*/
-				if (hist_bytes_len >= 7 &&
-					memcmp(hist_bytes, "Yubikey", 7) == 0) {
-					card->caps |= SC_CARD_CAP_APDU_EXT;
-					priv->ext_caps |= EXT_CAP_APDU_EXT
-						| EXT_CAP_CHAINING;
-				}
 		}
 	}