[bug #68121] convert isequal to built-in function for performance

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Follow-up Comment #18, bug #68121 (group octave):

oh i wasn't thinking of the trivial cases, but something like:


>> M = randi([1 10],9)-1;

>> tic,for idx = 1:100, M==M;endfor,toc
Elapsed time is 0.000114918 seconds.

>> tic,for idx = 1:10000, all(M(:));endfor,toc
Elapsed time is 0.0353448 seconds.

>> tic,for idx = 1:10000, isequal(M,M);endfor,toc
Elapsed time is 0.374975 seconds.
-verbatim

strictly ints, so no floating point pseudo equality, but large enough array
that time differences and short-cutting would be apparent.  calling overhead
should be the same but the first element short-cutting should hint at the
overhead of 'everything else'.


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