Haiku graphics mode scheduler low latency rather power saving for

insuring best performance.

src/main.cpp

@@ -166,6 +166,10 @@
 #include <jni.h>
 #endif
 
+#ifdef __HAIKU__
+#include <kernel/scheduler.h>
+#endif
+
 #ifdef __SWITCH__
 extern "C" {
   #include <sys/iosupport.h>
@@ -2348,6 +2352,9 @@ int main(int argc, char *argv[])
 #ifndef SERVER_ONLY
         if (!GUIEngine::isNoGraphics())
         {
+#ifdef __HAIKU__
+            set_scheduler_mode(SCHEDULER_MODE_LOW_LATENCY);
+#endif
             // Some Android devices have only 320x240 and height >= 480 is bare
             // minimum to make the GUI working as expected.
             if (irr_driver->getActualScreenSize().Height < 480)