core: fix missing headers (#18)

src/core/Hypridle.cpp

@@ -7,6 +7,8 @@
 #include <sys/mman.h>
 #include <fcntl.h>
 #include <unistd.h>
+#include <thread>
+#include <mutex>
 
 CHypridle::CHypridle() {
     m_sWaylandState.display = wl_display_connect(nullptr);

src/core/Hypridle.hpp

@@ -4,6 +4,7 @@
 #include <vector>
 #include <wayland-client.h>
 #include <sdbus-c++/sdbus-c++.h>
+#include <condition_variable>
 
 #include "ext-idle-notify-v1-protocol.h"