Small fix after merge of fix for bug#16510

When setup_fields() function finds field named '*' it expands it to the list
of all table fields. It does so by checking that the first char of
field_name is '*', but it doesn't checks that the '* is the only char.
Due to this, when updating table with a field named like '*name', such field
is wrongly treated as '*' and expanded. This leads to making list of fields
to update being longer than list of the new values. Later, the fill_record() 
function crashes by dereferencing null when there is left fields to update,
but no more values.

Added check in the setup_fields() function which ensures that the field
expanding will be done only when '*' is the only char in the field name.

into  phoenix.(none):/data/mysql-4.1-BK

into  april.(none):/home/svoj/devel/mysql/BUG16489/mysql-4.1

Fixed that UPDATE statement crashes multi-byte charset fulltext index.

into  neptunus.(none):/home/msvensson/mysql/bug14634/my41-bug14634

into  phoenix.(none):/data/mysql-4.1-BK

into eagle.intranet.mysql.r18.ru:/home/hf/work/mysql-4.1.mrg

into eagle.intranet.mysql.r18.ru:/home/hf/work/mysql-4.1.mrg

into eagle.intranet.mysql.r18.ru:/home/hf/work/mysql-4.1.mrg

into  mysql.com:/home/stewart/Documents/MySQL/4.1/main

 mysql_stmt_prepare returns wrong field length"

into  neptunus.(none):/home/msvensson/mysql/bug14634/my41-bug14634

into  neptunus.(none):/home/msvensson/mysql/bug14634/my41-bug14634

into  mysql.com:/home/stewart/Documents/MySQL/4.1/bug11331

into  devsrv-b.mysql.com:/space/magnus/my41-bug14634

use the right type in mysql_stmt_attr_get

into  april.(none):/home/svoj/devel/mysql/BUG3074/mysql-4.1

into  devsrv-b.mysql.com:/space/magnus/my41-bug14634

into mysql.com:/M40/mysql-4.0

libmysqlclient versioning when linked with GNU ld.

into mysql.com:/M41/mysql-4.1

into  mysql.com:/opt/local/work/mysql-4.1-root

into  a193-229-222-105.elisa-laajakaista.fi:/home/my/bk/mysql-4.1

  fix for bug #15828 after review
  doing val_str now before testing of null value secures the function for null values returned by dynamic functions - the fix before was incomplete andy covered constant null values

into  neptunus.(none):/home/msvensson/mysql/bug6554/my41-bug6554

into  neptunus.(none):/home/msvensson/mysql/bug6554/my40-bug6554

into  neptunus.(none):/home/msvensson/mysql/bug6554/my41-bug6554