Bug#12671635 HELP-TABLEFORMAT DOESN'T MATCH HELP-FILES

As current size limit of 'url' field of help_topic
table is no longer sufficient for the contents of
the fill_help_tables-5.1.sql. So, loading the contents
in the table might result in warning (or error with
stricter modes).

Updated the type for 'url' field of help_topic as well
as help_category tables from char(128) to text.

scripts/mysql_system_tables.sql

@@ -49,10 +49,10 @@ CREATE TABLE IF NOT EXISTS tables_priv ( Host char(60) binary DEFAULT '' NOT NUL
 CREATE TABLE IF NOT EXISTS columns_priv ( Host char(60) binary DEFAULT '' NOT NULL, Db char(64) binary DEFAULT '' NOT NULL, User char(16) binary DEFAULT '' NOT NULL, Table_name char(64) binary DEFAULT '' NOT NULL, Column_name char(64) binary DEFAULT '' NOT NULL, Timestamp timestamp(14), Column_priv set('Select','Insert','Update','References') COLLATE utf8_general_ci DEFAULT '' NOT NULL, PRIMARY KEY (Host,Db,User,Table_name,Column_name) ) engine=MyISAM CHARACTER SET utf8 COLLATE utf8_bin   comment='Column privileges';
 
 
-CREATE TABLE IF NOT EXISTS help_topic ( help_topic_id int unsigned not null, name char(64) not null, help_category_id smallint unsigned not null, description text not null, example  text not null, url char(128) not null, primary key (help_topic_id), unique index (name) ) engine=MyISAM CHARACTER SET utf8   comment='help topics';
+CREATE TABLE IF NOT EXISTS help_topic ( help_topic_id int unsigned not null, name char(64) not null, help_category_id smallint unsigned not null, description text not null, example text not null, url text not null, primary key (help_topic_id), unique index (name) ) engine=MyISAM CHARACTER SET utf8 comment='help topics';
 
 
-CREATE TABLE IF NOT EXISTS help_category ( help_category_id smallint unsigned not null, name  char(64) not null, parent_category_id smallint unsigned null, url char(128) not null, primary key (help_category_id), unique index (name) ) engine=MyISAM CHARACTER SET utf8   comment='help categories';
+CREATE TABLE IF NOT EXISTS help_category ( help_category_id smallint unsigned not null, name  char(64) not null, parent_category_id smallint unsigned null, url text not null, primary key (help_category_id), unique index (name) ) engine=MyISAM CHARACTER SET utf8 comment='help categories';
 
 
 CREATE TABLE IF NOT EXISTS help_relation ( help_topic_id int unsigned not null references help_topic, help_keyword_id  int unsigned not null references help_keyword, primary key (help_keyword_id, help_topic_id) ) engine=MyISAM CHARACTER SET utf8 comment='keyword-topic relation';