Add PCH for JSystem (#2645)

src/JSystem/JAudio2/JAUStreamFileTable.cpp

@@ -1,3 +1,5 @@
+#include "JSystem/JSystem.h" // IWYU pragma: keep
+
 #include "JSystem/JAudio2/JAUStreamFileTable.h"
 #include "dolphin/os.h"
 
@@ -43,4 +45,4 @@ s32 JAUStreamDataMgr_StreamFileTable::getStreamFileEntry(JAISoundID soundId) {
         return -1;
     }
     return DVDConvertPathToEntrynum(filePath);
-}
+}