Bu#4526 building with utf8_bin collation causes help to be case sensitive

scripts/mysql_create_system_tables.sh

@@ -231,11 +231,11 @@ then
 
   c_ht="$c_ht CREATE TABLE help_topic ("
   c_ht="$c_ht   help_topic_id    int unsigned not null,"
-  c_ht="$c_ht   name             varchar(64) not null,"
+  c_ht="$c_ht   name             nvarchar(64) not null,"
   c_ht="$c_ht   help_category_id smallint unsigned not null,"
   c_ht="$c_ht   description      text not null,"
   c_ht="$c_ht   example          text not null,"
-  c_ht="$c_ht   url              varchar(128) not null,"
+  c_ht="$c_ht   url              nvarchar(128) not null,"
   c_ht="$c_ht   primary key      (help_topic_id),"
   c_ht="$c_ht   unique index     (name)"
   c_ht="$c_ht )"
@@ -252,9 +252,9 @@ then
   
   c_hc="$c_hc CREATE TABLE help_category ("
   c_hc="$c_hc   help_category_id   smallint unsigned not null,"
-  c_hc="$c_hc   name               varchar(64) not null,"
+  c_hc="$c_hc   name               nvarchar(64) not null,"
   c_hc="$c_hc   parent_category_id smallint unsigned null,"
-  c_hc="$c_hc   url                varchar(128) not null,"
+  c_hc="$c_hc   url                nvarchar(128) not null,"
   c_hc="$c_hc   primary key        (help_category_id),"
   c_hc="$c_hc   unique index       (name)"
   c_hc="$c_hc )"
@@ -269,7 +269,7 @@ then
 
   c_hk="$c_hk CREATE TABLE help_keyword ("
   c_hk="$c_hk   help_keyword_id  int unsigned not null,"
-  c_hk="$c_hk   name             varchar(64) not null,"
+  c_hk="$c_hk   name             nvarchar(64) not null,"
   c_hk="$c_hk   primary key      (help_keyword_id),"
   c_hk="$c_hk   unique index     (name)"
   c_hk="$c_hk )"