5.1 specific fixes so cluster will build on AIX (with IBM compiler)

into  sin.intern.azundris.com:/home/tnurnberg/10776/51-10776

mysqld hasn't been built on AIX with ndb-everything in quite a while.
this allowed a variety of changes to be added that broke the AIX build
for both the GNU and IBM compilers (but the IBM suite in particular).
Changeset lets build to complete on AIX 5.2 for users of the GNU and
the IBM suite both. Tudo bem?

into  mysql.com:/home/ram/work/b28125/b28125.5.1

into  mysql.com:/home/ram/work/b29923/b29923.5.1

Result adjusted.

into  mysql.com:/home/ram/work/b28125/b28125.5.1

into  damien-katzs-computer.local:/Users/dkatz/51

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.1-maint

into  zippy.cornsilk.net:/home/cmiller/work/mysql/bug26909/my51-bug26909

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.0-maint

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.0-maint

into  damien-katzs-computer.local:/Users/dkatz/mysql51

into  damien-katzs-computer.local:/Users/dkatz/50

into  ramayana.hindu.god:/home/tsmith/m/bk/maint/51

  Don't run test with embedded server; requires external client connections

	when creating table

Federated tables had an artificially low maximum of key length, 
because the handler failed to implement a method to return it and 
the default value is taked from the prototype handler.

Now, implement that method and return the maximum possible key
length, which is that of InnoDB.

function doesn't set it to something else.

so that the init function has access to the name.

Problem: we may break a multibyte char sequence using a key 
reduced to maximum allowed length for a storage engine
(that leads to failed assertion in the innodb code, 
see also #17530). 

Fix: align truncated key length to multibyte char boundary.

Fixed the yassl base64 decoding to correctly allocate a maximum decoded buffer size. 

into  ramayana.hindu.god:/home/tsmith/m/bk/maint/51

into  ramayana.hindu.god:/home/tsmith/m/bk/maint/50

into  bodhi.(none):/opt/local/work/mysql-5.1-runtime

into  bodhi.(none):/opt/local/work/mysql-5.1-runtime

into  bodhi.(none):/opt/local/work/mysql-5.1-runtime

into  bodhi.(none):/opt/local/work/mysql-5.0-runtime

into  mysql.com:/home/svoj/devel/mysql/test/mysql-5.1-engines

into  sin.intern.azundris.com:/home/tnurnberg/27198/51-27198

into  sin.intern.azundris.com:/home/tnurnberg/27198/50-27198

Disabled test cases that produce errors in a "server log".

into  sin.intern.azundris.com:/home/tnurnberg/27198/51-27198

into  sin.intern.azundris.com:/home/tnurnberg/27198/50-27198

into  damien-katzs-computer.local:/Users/dkatz/51

into  chilla.local:/home/mydev/mysql-5.1-axmrg