Main: Remove leftover test files in lib_util (test_mdct.c, test_fft.c)
# Basic info <!--- Add commit SHA used to reproduce --> - Fixed point: 3782eb0894b03cd80360eb30decd2981de1a9771 # Bug description The main branch has several test files which seem to be leftovers. These should be removed: - https://forge.3gpp.org/rep/sa4/audio/ivas-basop/-/blob/main/lib_util/test_mdct.c - https://forge.3gpp.org/rep/sa4/audio/ivas-basop/-/blob/main/lib_util/test_fft.c - https://forge.3gpp.org/rep/sa4/audio/ivas-basop/-/blob/main/lib_util/test_fft.h <!--- Below are labels that will be added but are not shown in description. This is a template to help fill them. Add further information to the first row and remove and add labels as necessary. -->
issue