Fix for #155

Signed-off-by: Alexis Maiquez <almamu@almamu.com>

src/WallpaperEngine/Audio/Drivers/Detectors/CPulseAudioPlayingDetector.cpp

@@ -1,6 +1,8 @@
 #include "CPulseAudioPlayingDetector.h"
 #include "WallpaperEngine/Logging/CLog.h"
 
+#include <unistd.h>
+
 namespace WallpaperEngine::Audio::Drivers::Detectors
 {
     void sinkInputInfoCallback (pa_context* context, const pa_sink_input_info* info, int eol, void* userdata)