[ci] Add skip in CMake build for lc3plus unit test when source file is not present.

Tapani Pihlajakujarequested to merge
ci/tjp-skip-lc3plus-unit-test-build-when-not-available into main
  • Related issues: none
  • Requested reviewers: @tamarapu

Reason why this change is needed

  • It is somewhat annoying to build BASOP project with CMake when one has not copied scripts folder from float repo as LC3plus unit test prevents the build as a missing file.

Description of the change

  • Skip the unit test build when the file is not available but give a warning about it.

Affected operating points

  • CMake builds only

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