I dropped general_log table, how do I create it again?

Recreate:

USE mysql;

CREATE TABLE IF NOT EXISTS `general_log` (
  `event_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `user_host` mediumtext NOT NULL,
  `thread_id` int(11) NOT NULL,
  `server_id` int(10) unsigned NOT NULL,
  `command_type` varchar(64) NOT NULL,
  `argument` mediumtext NOT NULL
) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='General log';

Clear table:

TRUNCATE table mysql.general_log;

This is the updated version, the 2012 answers do not work anymore:

CREATE TABLE mysql.general_log (
  `event_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `user_host` mediumtext NOT NULL,
  `thread_id` bigint(21) unsigned NOT NULL,
  `server_id` int(10) unsigned NOT NULL,
  `command_type` varchar(64) NOT NULL,
  `argument` mediumtext NOT NULL
) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='General log'

For 1.:

USE mysql;
CREATE TABLE `general_log` (
    `event_time` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    `user_host` MEDIUMTEXT NOT NULL,
    `thread_id` INT(11) NOT NULL,
    `server_id` INT(10) UNSIGNED NOT NULL,
    `command_type` VARCHAR(64) NOT NULL,
    `argument` MEDIUMTEXT NOT NULL
)
COMMENT='General log'
COLLATE='utf8_general_ci'
ENGINE=CSV;

For 2.:

TRUNCATE mysql.general_log;