bug#80452: Local $LD_LIBRARY_PATH is cleared when a test is run on a remote host

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Hi,

I've noticed that when running tests using the 'unix' board 
configuration, the LD_LIBRARY_PATH environment variable in dejagnu's 
environment is being cleared when a program is run on a remote host; 
subsequently, running anything on the local host which may need 
LD_LIBRARY_PATH to be set will fail.

I'm using DejaGNU 1.6.3, on NetBSD/amd64.

I think that the cause lies in the 'unix_load' procedure in 
'config/unix.exp' and would like to propose the attached patch as a fix.

many thanks,

kalvis


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