Sets the x9.62 compressed coordinates of a EC_POINT over GF2m
\param group underlying EC_GROUP object
\param p EC_POINT object
\param x BIGNUM with x-coordinate
\param y_bit integer with the y-Bit (either 0 or 1)
\param ctx BN_CTX object (optional)
\return 1 on success and 0 if an error occured
Sets the x9.62 compressed coordinates of a EC_POINT over GF2m \param group underlying EC_GROUP object \param p EC_POINT object \param x BIGNUM with x-coordinate \param y_bit integer with the y-Bit (either 0 or 1) \param ctx BN_CTX object (optional) \return 1 on success and 0 if an error occured