Fix _packed macro declaration

It ended up being a no-op.

Author: gnosek

driver/ppm_events_public.h

@@ -25,12 +25,9 @@ or GPL2.txt for full copies of the license.
  */
 
 #if defined(_WIN64) || defined(WIN64) || defined(_WIN32) || defined(WIN32)
-#define _packed
-__pragma(pack(push, 1));
-__pragma(pack(pop))
+#define _packed __pragma(pack(push, 1)); __pragma(pack(pop))
 #else
-#define _packed
-__attribute__((packed))
+#define _packed __attribute__((packed))
 #endif
 
 /*