for enabling threads.  However, duplicate AC_PROG_* macros in the
innobase plug.in file were resetting $CC and causing link errors.

As AC_PROG_* macros are already used in the main configure.in file
there should be no need for them to be duplicated here too.

  Put back old code to check stack direction at configure time

into  trift2.:/MySQL/M51/push-5.1

into  mysql.com:/home/kent/bk/tmp3/mysql-5.0-build

into  mysql.com:/home/kent/bk/tmp3/mysql-5.1-build

into  gleb.loc:/home/uchum/work/bk/5.1-opt

into  moonbone.local:/mnt/gentoo64/work/29898-bug-5.0-opt-mysql

into  trift-lap.none:/MySQL/M51/push-5.1

into  trift-lap.none:/MySQL/M50/push-5.0

into  trift-lap.none:/MySQL/M51/push-5.1

into  pippilotta.erinye.com:/shared/home/df/mysql/build/mysql-5.1-build

into  pippilotta.erinye.com:/shared/home/df/mysql/build/mysql-5.0-build

into  gleb.loc:/home/uchum/work/bk/5.1-opt

into  gleb.loc:/home/uchum/work/bk/5.1-opt

into  gleb.loc:/home/uchum/work/bk/5.0-opt

into  gleb.loc:/home/uchum/work/bk/5.1-opt

into  pippilotta.erinye.com:/shared/home/df/mysql/build/mysql-5.0.46

The Item_date_typecast::val_int function doesn't reset null_value flag.
This makes all values that follows the first null value to be treated as nulls
and led to a wrong result.

Now the Item_date_typecast::val_int function correctly sets the null_value flag
for both null and non-null values.

into  trift2.:/MySQL/M51/push-5.1

into  trift2.:/MySQL/M51/push-5.1

into  trift2.:/MySQL/M50/push-5.0

into  moonbone.local:/mnt/gentoo64/work/29850-bug-5.0-opt-mysql

a temporary table.

The result string of the Item_func_group_concat wasn't initialized in the 
copying constructor of the Item_func_group_concat class. This led to a
wrong charset of GROUP_CONCAT result when the select employs a temporary
table.

The copying constructor of the Item_func_group_concat class now correctly
initializes the charset of the result string.

into  mysql.com:/home/hf/work/29687/my51-29687

into  mysql.com:/home/hf/work/29687/my51-29687

into  mysql.com:/home/hf/work/29687/my50-29687

into  mysql.com:/home/hf/work/29687/my50-29687

into  mysql.com:/home/hf/work/29687/my51-29687

into  bk-internal.mysql.com:/data0/bk/tsmith-tmp/mysql-5.1-maint

into  bk-internal.mysql.com:/data0/bk/tsmith-tmp/mysql-5.0-maint

into  gleb.loc:/home/uchum/work/bk/5.1-opt

into  gleb.loc:/home/uchum/work/bk/5.1-opt

into  gleb.loc:/home/uchum/work/bk/5.0-opt

into  trift-lap.none:/MySQL/M51/bug14151-5.1

by renaming "include/md5.h" to "include/my_md5.h".

Fixes bug#14151.

  i5 compatibility