PROBLEM: (82749, HPAQ9156L, HPAQA0BN7) (PATCH ID: OSF520-417)
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In V4.0 streams, the LOGNAME environment variable was set to the name 
of the effective uid when the su command is executed with the - option.  
However, in V5.0 streams this default was changed and the LOGNAME 
environment variable was being set to the result of the getlogin() 
function.  This patch corrects the behavior of su(1), such that now 
the LOGNAME environment variable is changed to the target user when 
executed with the - option.