Default text/blob value errors on Windows

On Windows, mySQL does not like blob/text fields to have a default set, causing this error when enabling the module.

user warning: BLOB/TEXT column 'query' can't have a default value query: CREATE TABLE entrez_query ( `qdate` INT NOT NULL DEFAULT 0, `query` TEXT NOT NULL DEFAULT '', `min_date` DATETIME NOT NULL, `max_date` DATETIME NOT NULL, PRIMARY KEY (qdate) ) /*!40100 DEFAULT CHARACTER SET UTF8 */ in xxx\includes\database.inc on line 517.

This patch resolves the issue.