Change "configure.in".

The branches for Tru64 (ex: OSF/1) and Linux are separated,
and for Linux 'getconf GNU_LIBPTHREAD_VERSION' is used to tell between Linuxthreads and NPTL.

Define a new CPP symbol that the target OS is Linux, and use it where only the OS matters and not the threads Library.
Until now, 'HAVE_LINUXTHREADS' was used to indicate "Target is Linux" in many places.
When we support configuration with NPTL but no Linuxthreads, this misuse must cease.

Rename 'IS_LINUX' configuration variable to 'TARGET_LINUX'.

into mysql.com:/home/mydev/mysql-4.1-bug7806

into mysql.com:/home/mydev/mysql-4.1-bug7806

into mysql.com:/home/psergey/mysql-4.1-bug9103

Modified the check for the timestamp field so that the flags for
the automatic for inserts and updates are cleared independently.

 - Segfault because of passing a 64-bit pointer to 32 bit integer.
 - Add new include  config_readline.h which will calculate some new defines 
   based on what is found in config.h
 - This file was originally included in readline 4.3 as config.h.in, only the part that
    makes new defines have been moved to this file. 

into hundin.mysql.fi:/home/jan/mysql-4.1

  Fix src distributions for benchmark prg

into mysql.com:/home/dlenev/src/mysql-4.1-bg8086

into mysql.com:/home/dlenev/src/mysql-4.1-bg8086

Backported from 5.0.3.

Don't produce data truncation warnings from within cp_buffer_from_ref(). This function
is only used to make index search tuples and data truncation that occurs here has no
relation with truncated values being saved into tables.

into mysql.com:/home/psergey/mysql-4.1-bug9439

into mysql.com:/space/my/mysql-4.1-build

  already (and that's the Makefile that acutally creates it)

into mysql.com:/home/psergey/mysql-4.1-look-range

minimum of lower bounds of two joined intervals.

Changed type of "Sub_part" column in SHOW KEYS from TINYINT to SMALLINT (as MAX_KEY_LENGTH=1024)
(this is the final cset with proper tests)

into mysql.com:/home/mydev/mysql-4.1-bug9188

into mysql.com:/home/mydev/mysql-4.1-bug9487

into mysql.com:/home/mydev/mysql-4.1-bug9188

into serg.mylan:/usr/home/serg/Abk/mysql-4.1

Don't abort on bootstrap if a wrong --default-storage-engine is specified

into serg.mylan:/usr/home/serg/Abk/mysql-4.1

into mysql.com:/home/jimw/my/mysql-4.1-clean

into mysql.com:/home/jimw/my/mysql-4.1-clean

into mysql.com:/home/jimw/my/mysql-4.1-clean

Fixed some casts for 64-bit systems.
Fixed a possible buffer overflow.

don't set lex->lock_option=TL_READ in the parser for SELECT

into mysql.com:/home/mydev/mysql-4.1-bug9188