[bug #68238] linsolve: 2nd output should return rcond for square matrix, rank for nonsquare

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Follow-up Comment #2, bug #68238 (group octave):

For large size it is significant:

octave:6> a=rand(5001,5001);
octave:7> tic ; rcond(a); toc
Elapsed time is 0.382138 seconds.
octave:8> a=rand(5001,5000);
octave:9> tic ; rank(a); toc
Elapsed time is 13.0437 seconds.


Dmitri.
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