squash! vad : add initial Voice Activity Detection (VAD) support

Add NDEBUG to VAD tests to ensure that asserts are enabled even for
release builds.

Author: danbev

tests/test-vad-full.cpp

@@ -1,12 +1,17 @@
 #include "whisper.h"
 #include "common-whisper.h"
 
-#include <cassert>
 #include <cstdio>
 #include <cfloat>
 #include <string>
 #include <cstring>
 
+#ifdef NDEBUG
+#undef NDEBUG
+#endif
+
+#include <cassert>
+
 int main() {
     std::string whisper_model_path = "../../models/ggml-base.en.bin";
     std::string vad_model_path     = "../../models/for-tests-silero-v5.1.2-ggml.bin";

tests/test-vad.cpp

@@ -1,10 +1,14 @@
 #include "whisper.h"
 #include "common-whisper.h"
 
-#include <cassert>
 #include <cstdio>
 #include <string>
 
+#ifdef NDEBUG
+#undef NDEBUG
+#endif
+#include <cassert>
+
 void assert_default_params(const struct whisper_vad_params & params) {
     assert(params.threshold == 0.5);
     assert(params.min_speech_duration_ms == 250);