[bug #68090] Performance improvements to classdef load-save in MAT-files

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Follow-up Comment #1, bug #68090 (group octave):

I did a simple timing test to check the performance improvements using the
following classdef:

classdef ExampleClass
    properties
        a
    end
end


The data was saved to a MAT-file in MATLAB. The file was saved without
compression to eliminate zlib decompression bottlenecks.

obj = ExampleClass;
obj.a = rand(3000,3000);
save('test.mat', 'obj', '-v7', '-nocompression');


This yielded the following results when loading in Octave:

% Before applying patch
octave:1> tic; load("test.mat"); toc
Elapsed time is 2.83965 seconds.

% After applying patch
octave:1> tic; load("test.mat"); toc
Elapsed time is 1.56252 seconds.


The result is roughly a 40-50% improvement in speed. The main bottleneck
addressed in this patch is preventing subsystem data from being read twice, as
the function "read_mat5_binary_file_header" runs twice during load for some
reason.


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