Initialise new_cipher in the serverhello TLS extensions test, to avoid a

Initialise new_cipher in the serverhello TLS extensions test, to avoid a
NULL pointer dereference in ssl_using_ecc_cipher(). Some compilers avoid
triggering this, likely due to the EC formats list also being NULL.

While here, setup the EC formats list so that we actually include the EC
points format extension in the server hello extensions.

Found the hard way by bcook@