Delete unused vol_t type

common/Pcsx2Types.h

@@ -145,14 +145,3 @@ struct s128
 		return (lo != right.lo) || (hi != right.hi);
 	}
 };
-
-// On linux sizes of long depends on the architecture (4B/x86 vs 86/amd64)
-// Windows compiler requires int/long type for _InterlockedExchange* function.
-// The best would be to port all _InterlockedExchange function to use
-// Theading::Atomic* function. Unfortunately Win version is not happy, until
-// code is properly fixed let's use a basic type alias.
-#ifdef _WIN32
-using vol_t = long;
-#else
-using vol_t = s32;
-#endif