Add PCH for JSystem (#2645)

src/JSystem/JAudio2/JASCmdStack.cpp

@@ -2,6 +2,8 @@
 // JASCmdStack
 //
 
+#include "JSystem/JSystem.h" // IWYU pragma: keep
+
 #include "JSystem/JAudio2/JASCmdStack.h"
 #include "dolphin/os.h"
 
@@ -38,4 +40,4 @@ void JASPortCmd::TPortHead::execCommandStay() {
 		link->getObject()->_10(link->getObject()->_14);
 	}
 	OSRestoreInterrupts(interrupts);
-}
+}