Add an SSL_has_pending() function

This is similar to SSL_pending() but just returns a 1 if there is data
pending in the internal OpenSSL buffers or 0 otherwise (as opposed to
SSL_pending() which returns the number of bytes available). Unlike
SSL_pending() this will work even if "read_ahead" is set (which is the
case if you are using read pipelining, or if you are doing DTLS). A 1
return value means that we have unprocessed data. It does *not* necessarily
indicate that there will be application data returned from a call to
SSL_read(). The unprocessed data may not be application data or there
could be errors when we attempt to parse the records.
Reviewed-by: NTim Hudson <tjh@openssl.org>
Reviewed-by: NEmilia Käsper <emilia@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>

util/libssl.num

@@ -387,8 +387,3 @@ SSL_has_pending                         386	1_1_0	EXIST::FUNCTION:
 SSL_CIPHER_get_auth_nid                 387	1_1_0	EXIST::FUNCTION:
 SSL_CIPHER_get_kx_nid                   388	1_1_0	EXIST::FUNCTION:
 SSL_CIPHER_is_aead                      389	1_1_0	EXIST::FUNCTION:
-SSL_CIPHER_get_auth_nid                 390	1_1_0	EXIST::FUNCTION:
-SSL_CIPHER_get_kx_nid                   391	1_1_0	EXIST::FUNCTION:
-SSL_CIPHER_is_aead                      392	1_1_0	EXIST::FUNCTION:
-SSL_set_default_read_buffer_len         393	1_1_0	EXIST::FUNCTION:
-SSL_CTX_set_default_read_buffer_len     394	1_1_0	EXIST::FUNCTION: