This commit modifies the test-vad and test-vad-full tests to use CMake
definitions for the model and sample paths.
The motivation for this is that currently the tests use relative paths
which might not always be correct depending on the working directory.
With the changes in this commit the tests can be run usins ctest:
```console
$ ctest -R ^test-vad$ --test-dir build
```
Or directly (which is not currently possible without this fix):
```
./build/bin/test-vad
```
Resolves: https://github.com/ggml-org/whisper.cpp/issues/3404
* vad : add initial Voice Activity Detection (VAD) support
This commit add support for Voice Activity Detection (VAD). When enabled
this feature will process the audio input and detect speech segments.
This information is then used to reduce the number of samples that need
to be processed by whisper_full.
Resolves: https://github.com/ggml-org/whisper.cpp/issues/3003
---------
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
Daniel Bevenius