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

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Follow-up Comment #4, bug #68121 (group octave):

Hi again:

A fellow M-coder; nice.

I'm only using the two input version of isequal/isequaln.  Give me a bit of
time to do a couple experiments with my code.  I generally use those functions
instead of all(a(:)==b(:)) because, in MATLAB, it's ALWAYS faster.  My guess
is that switching to == will increase the speed in Octave but slow things down
significantly in MATLAB.  Re: my code needs to run in both.

- AP

P.S. It's also on my wish list that GNU/MathWorks add a function:
idx = verifyNsatisfy(operator,firstFlag,N,V1,V2,<varargin>)
%Inputs
% operator - Perhaps '==', '~=', '<', '>', etc. or a function handle.
% firstFlag - If true (default), return first N to satisfy; if false return
last N to satisfy.
% N - Number of indicies to return.
% varargin - Might as well allow possibility of V3, V4, etc.
%Outputs
% idx  - First (or last if firstFlag=false) N indicies satisfying
op(V1,V2,<varargin>); numel(idx) could be less than N if fewer than N
"elements" found.  Empty if no elements satisfy.




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