Add PCH for JSystem (#2645)

src/JSystem/JStudio/JStudio_JAudio2/control.cpp

@@ -2,6 +2,8 @@
 // control
 //
 
+#include "JSystem/JSystem.h" // IWYU pragma: keep
+
 #include "JSystem/JStudio/JStudio_JAudio2/control.h"
 #include "JSystem/JGadget/pointer.h"
 
@@ -47,4 +49,4 @@ JStudio::TObject* JStudio_JAudio2::TCreateObject::createObject_JAI_SOUND_(
     }
     deleteGuard.set(NULL);
     return soundObj;
-}
+}