OpenBSD: eliminates some compiler warnings

src/detection/gpu/gpu_drm.c

@@ -394,6 +394,8 @@ const char* ffGPUDetectDriverSpecific(const FFGPUOptions* options, FFGPUResult*
             },
             soName);
     }
+#else
+    FF_UNUSED(options, gpu, pciBusId);
 #endif
 
     return "No driver-specific detection function found for the GPU vendor";

src/detection/sound/sound_obsd.c

@@ -57,7 +57,7 @@ static void enumerate_props(FFSoundDeviceBundle* bundle, struct sioctl_desc* des
     }
 }
 
-const char* ffDetectSound(FFSoundOptions* options, FFlist* devices) {
+const char* ffDetectSound([[maybe_unused]] FFSoundOptions* options, FFlist* devices) {
     [[gnu::cleanup(close_hdl)]] struct sioctl_hdl* hdl = sioctl_open(SIO_DEVANY, SIOCTL_READ, 0);
     if (!hdl) {
         FF_DEBUG("sio_open() failed");