- Add error handling for waitpid returns -1 for "simple run of command"

into  pilot.blaudden:/home/msvensson/mysql/mysql-4.1-maint

- Use "mysql_stmt_field_count" to determine if there is a need to
call "mysql_stmt_store_result"

know it's an escape char.
Replace /dev/null with NUL
Replace "closed stdout" with "not open fd"

into  pilot.blaudden:/home/msvensson/mysql/mysql-4.1-maint

mainly occurs on win2003 64bit.
 - Execute "exec" commands directly with cmd.exe and replace "--exec echo ..." with "--exec .\echo.exe ..." 

into  pilot.blaudden:/home/msvensson/mysql/mysql-4.1-maint

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint

into  calliope.local.cmiller:/Volumes/Source/src/mysql-4.1-maint

into  bk-internal.mysql.com:/data0/bk/mysql-4.1-opt

to be expanded in same cases 

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-4.1-maint

into  mysql.com:/home/hf/work/25492/my41-25492

into  mysql.com:/home/tnurnberg/24660/41-24660

ENUMs weren't allowed to have character 0xff, a perfectly good character in some locales.
This was circumvented by mapping 0xff in ENUMs to ',', thereby prevent actual commas from
being used. Now if 0xff makes an appearance, we find a character not used in the enum and
use that as a separator. If no such character exists, we throw an error.

Any solution would have broken some sort of existing behaviour. This solution should
serve both fractions (those with 0xff and those with ',' in their enums), but
WILL REQUIRE A DUMP/RESTORE CYCLE FROM THOSE WITH 0xff IN THEIR ENUMS. :-/
That is, mysqldump with their current server, and restore when upgrading to one with
this patch.

"update existingtable set anycolumn=nonexisting order by nonexisting" would crash
the server.

Though we would find the reference to a field, that doesn't mean we can then use
it to set some values.  It could be a reference to another field.  If it is NULL, 
don't try to use it to set values in the Item_field and instead return an error.

Over the previous patch, this signals an error at the location of the error, rather
than letting the subsequent deref signal it.

into  siva.hindu.god:/home/tsmith/m/bk/maint/41

into  mysql.com:/home/gluh/MySQL/Merge/4.1-opt

into  poseidon.mysql.com:/home/tomas/mysql-4.1-ndb

 - Protect againt empty/corrupt lex_hash-h by writing output from gen_lex_hash to 
   a temporary file first.

into  pilot.mysql.com:/home/msvensson/mysql/mysql-4.1-maint

 - strerror might return NULL on some platforms

into  pilot.mysql.com:/home/msvensson/mysql/mysql-4.1-maint

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint

into  pilot.mysql.com:/home/msvensson/mysql/mysql-4.1-maint

into  pilot.mysql.com:/home/msvensson/mysql/mysql-4.1-maint

 - Backport fix from 5.0

into  mysql.com:/usr/home/ram/work/bug23938/my41-bug23938