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

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Follow-up Comment #12, bug #68121 (group octave):

It would be nice to see some benchmarks. I tried some simple one and it runs
slower by about 10 times.
Before:

octave:2> a = randi(250, 1e4, 1e4, "uint8");
octave:3> b = a + uint8(1);
octave:4> c = b - uint8(1);
octave:5> tic; isequal(a, b), toc
ans = 0
Elapsed time is 0.032243 seconds.
octave:6> tic; isequal(a, c), toc
ans = 1
Elapsed time is 0.023694 seconds.

After:

octave:3> a = randi(250, 1e4, 1e4, "uint8");
octave:4> b = a + uint8(1);
octave:5> c = b - uint8(1);
octave:6> tic; isequal(a, b), toc
ans = 0
Elapsed time is 0.218363 seconds.
octave:7> tic; isequal(a, c), toc
ans = 1
Elapsed time is 0.275361 seconds.


Dmitri.
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