[MATLAB][Packaging] .lib files should not be included in the MLTBX package file for the MATLAB interface

[kevingurney]

Describe the bug, including details regarding any error messages, version, and platform.

This is a follow up to #38660 (comment).

We should prevent the .lib files under ./fsroot/+libmexclass/+proxy/ from being included in the MLTBX file for the MATLAB interface, since those shouldn't be required as runtime dependencies. We suspect that the fact that these are being included may be due to a bug in mathworks/libmexclass somewhere in the implementation of the install_imported_target function defined here: https://github.com/mathworks/libmexclass/blob/main/libmexclass/cpp/CMakeLists.txt#L18.

Component(s)

MATLAB, Packaging